Kamala Harris is visiting the US southern border for the first time since becoming the Democratic presidential nominee.
Although numbers of migrants crossing this border have dropped significantly in recent months, Donald Trump has been attacking her record – and President Biden’s – on illegal immigration.
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Trump claims that “Kamala Harris has allowed 21 million illegals to pour in from all over the world.”
The Democrats blame Trump, saying he worked to block the passing of a bill that would have tightened up security at the border.
So what do we know about the people crossing it illegally?
How many migrants have crossed the US southern border?
US border officials record “encounters” with migrants, which include people who attempted to cross illegally and people who tried to enter legally but were deemed inadmissible.
These encounters have risen to record highs under the Biden administration but not to the level Trump claims.
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Since January 2021, when Joe Biden came to office, there have been more than 10 million encounters – about 8 million came over the southwest land border with Mexico.
Under the Trump administration, there were 2.4 million encounters on this border.
Encounters fell at the start of 2020 as arrivals slowed because of the pandemic.
The number of encounters is not a count of individuals who stay in the US as some migrants will be returned and the same person can be recorded trying to enter multiple times.
These figures don’t include people who may have crossed the border undetected.
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The US Department of Homeland Security has estimated there were 11 million illegal migrants living in the US as of January 2022.
It says about a fifth of them arrived in 2010 or later but the majority arrived before this time, some as early as the 1980s.
The factors driving this included a post-lockdown surge in crossings and political and economic instability in countries such as Venezuela.
In response, Biden issued an executive order in June 2024 to quickly deport migrants at the border.
This means migrants can be sent back without having their asylum claims processed, if the average number of weekly encounters exceeded a certain threshold.
A month after the order was introduced, encounters at the southern border fell by a fifth.
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Efforts by the Mexican government have also brought crossings down, including setting up new checkpoints and increasing patrols.
In May, Mexican President Andrés Manuel López Obrador said that the number of migrants at the US southern border had halved from a peak of 12,000 a day to 6,000 a day.
The vast majority of people who cross the US southern border are citizens of nearby countries in the Americas.
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Recent figures show that in the current financial year (October 2023 – September 2024), the most common nationality encountered at the southern border were Mexicans (617,770).
This was followed by nearly a quarter of a million Venezuelans and almost 200,000 Guatemalans.
There have also been 36,920 encounters of Chinese citizens this financial year to date.
That’s 10,000 higher than for the whole of the previous financial year.
How many border migrants have criminal records?
Trump has repeatedly said about illegal migrants that “many of them that are coming in are from prisons and jails and mental institutions, insane asylums”.
There are no publicly available figures on how many migrants have spent time in prison or in mental institutions but there is data on how many have previous criminal convictions.
The most common conviction was for illegal entry into another country (9,545), followed by driving under the influence (2,577), and drug possession and trafficking offences (1,414).
On 27 September, US Immigration and Customs Enforcement (ICE) released figures showing it had recorded 662,566 “noncitizens with criminal histories” – which includes those currently detained by the agency and those not detained.
It says 435,719 of them are convicted criminals and 226,847 have pending criminal charges.
The figures go up to July 2024 but ICE does not say when the cases date back to or when these people arrived in the US.
But crime and migration trends have travelled in opposite directions in recent years.
Department of Justice figures show a long-term decline in violent crime, with rates of victimisation in 2023 broadly similar to five years ago. Recent FBI data also indicates a downward trend in violence.
With just one day to go, the race for the White House is deadlocked – both at the national level and in the all-important battleground states.
The polls are so close, within the margin of error, that either Donald Trump or Kamala Harris could actually be two or three points better off – enough to win comfortably.
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There is a compelling case to make for why each may have the edge when it comes to building a coalition of voters in the right places, and then ensuring they actually turn out.
Let’s start with the history-making possibility that a defeated president might be re-elected for the first time in 130 years.
Trump could win because…
1. He’s not in power
The economy is the number one issue for voters, and while unemployment is low and the stock market is booming, most Americans say they are struggling with higher prices every day.
Inflation hit levels not seen since the 1970s in the aftermath of the pandemic, giving Trump the chance to ask “Are you better off now than you were four years ago?”
In 2024, voters around the world have several times thrown out the party in power, partly due to the high, post-Covid, cost of living. US voters also seem hungry for change.
Only a quarter of Americans say they are satisfied with the direction the country is going in and two-thirds have a poor economic outlook.
Harris has tried to be the so-called change candidate, but as vice-president has struggled to distance herself from an unpopular Joe Biden.
2. He seems impervious to bad news
Despite the fallout from the 6 January 2021 riot at the US Capitol, a string of indictments and an unprecedented criminal conviction, Trump’s support has remained stable all year at 40% or above.
While Democrats and “Never-Trump” conservatives say he is unfit for office, most Republicans agree when Trump says he’s the victim of a political witch-hunt.
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With both sides so dug in, he just needs to win over enough of the small slice of undecided voters without a fixed view of him.
3. His warnings on illegal immigration resonate
Beyond the state of the economy, elections are often decided by an issue with an emotional pull.
Democrats will hope it’s abortion, while Trump is betting it’s immigration.
After encounters at the border hit record levels under Biden, and the influx impacted states far from the border, polls suggest voters trust Trump more on the immigration – and that he’s doing much better with Latinos than in previous elections.
Trump’s appeal to voters who feel forgotten and left behind has transformed US politics by turning traditional Democratic constituencies like union workers into Republicans and making the protection of American industry by tariffs almost the norm.
If he drives up turnout in rural and suburban parts of swing states this can offset the loss of moderate, college-educated Republicans.
5. He’s seen as a strong man in an unstable world
Trump’s detractors say he undermines America’s alliances by cosying up to authoritarian leaders.
The former president sees his unpredictability as a strength, however, and points out that no major wars started when he was in the White House.
Many Americans are angry, for different reasons, with the US sending billions to Ukraine and Israel – and think America is weaker under Biden.
Despite Trump’s advantages, he remains a deeply polarising figure.
In 2020, he won a record number of votes for a Republican candidate, but was defeated because seven million more Americans turned out to support Biden.
This time, Harris is playing up the fear factor about a Trump return. She’s called him a “fascist” and a threat to democracy, while vowing to move on from “drama and conflict”.
A Reuters/Ipsos poll in July indicated that four in five Americans felt the country was spiralling out of control. Harris will be hoping voters – especially moderate Republicans and independents – see her as a candidate of stability.
2. She’s also not Biden
Democrats were facing near-certain defeat at the point Biden dropped out of the race. United in their desire to beat Trump, the party quickly rallied around Harris. With impressive speed from a standing start, she delivered a more forward-looking message that excited the base.
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While Republicans have tied her to Biden’s more unpopular policies, Harris has rendered some of their Biden-specific attack lines redundant.
The clearest of these is age – polls consistently suggested voters had real concerns about Biden’s fitness for office. Now the race has flipped, and it is Trump who’s vying to become the oldest person to ever win the White House.
This is the first presidential election since the US Supreme Court overturned Roe v Wade and the constitutional right to an abortion.
Voters concerned about protecting abortion rights overwhelmingly back Harris, and we’ve seen in past elections – notably the 2022 midterms – that the issue can drive turnout and have a real impact on the result.
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This time around, 10 states, including the swing state Arizona, will have ballot initiatives asking voters how abortion should be regulated. This could boost turnout in Harris’s favour.
The historic nature of her bid to become the first female president may also strengthen her significant lead among women voters.
4. Her voters are more likely to show up
The groups Harris is polling more strongly with, such as the college-educated and older people, are more likely to vote.
Democrats ultimately perform better with high-turnout groups, while Trump has made gains with relatively low-turnout groups such as young men and those without college degrees.
Trump, for example, holds a huge lead among those who were registered but didn’t vote in 2020, according to a New York Times/Siena poll.
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A key question, then, is whether they will show up this time.
5. She’s raised – and spent – more money
It’s no secret that American elections are expensive, and 2024 is on track to be the most expensive ever.
But when it comes to spending power – Harris is on top. She’s raised more since becoming the candidate in July than Trump has in the entire period since January 2023, according to a recent Financial Times analysis, which also noted that her campaign has spent almost twice as much on advertising.
This could play a role in a razor-tight race that will ultimately be decided by voters in swing states currently being bombarded by political ads.
Kamala Harris, the current vice-president, is the candidate for the Democratic Party. She joined the race after President Joe Biden dropped out and no other Democrats stood against her.
There are also some independent candidates running for president. One of the most prominent was Robert F Kennedy Jr, but he suspended his campaign in August and backed Trump.
The Democrats are the liberal political party, known for supporting civil rights, a social safety net and measures to address climate change.
In the 2024 election, issues highlighted by Harris include tackling the cost-of-living crisis and supporting abortion rights.
The Republicans are the conservative political party. They have stood for lower taxes, shrinking the size of the government and gun rights.
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Issues Trump has campaigned on include tackling illegal immigration and ending inflation to “make America affordable again”.
How does the US presidential election work?
The winner is not the person who gets the most votes overall.
Instead, both candidates compete to win contests held across the 50 states.
Each state has a certain number of so-called electoral college votes, partly based on population. There are a total of 538 up for grabs and the winner is the candidate that gets 270 or more.
All but two states have a winner-takes-all rule, so whichever candidate has the highest number of votes is awarded all of its electoral college votes.
Most states lean heavily towards one party or the other, so the focus is on about seven states where either of them could win. These are known as the battleground or swing states.
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It is possible for a candidate to win the most votes nationally – like Hillary Clinton did in 2016 – but still be defeated.
Most US citizens aged 18 or over are eligible to vote.
Each state has its own voter registration process and deadline.
Who else is being elected in November?
All of the attention will be on who wins the presidency, but voters will also be choosing new members of Congress – where laws are passed – when they fill in their ballots.
Congress consists of the House of Representatives, where all 435 seats are up for election, and the Senate, where 34 seats are being contested.
Republicans currently control the House, which initiates spending plans. Democrats are in charge of the Senate, which votes on key appointments in government.
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These two chambers pass laws and can act as a check on White House plans if the controlling party in either chamber disagrees with the president.
When will we know who has won the election?
Usually the winner is declared on the night of the election, but in 2020 it took a few days to count all the votes.
The period after the election is known as the transition, if there is a change of president.
This gives the new administration time to appoint cabinet ministers and make plans for the new term.
The president is officially sworn into office in January in a ceremony known as the inauguration, held on the steps of the Capitol building in Washington DC.
American voters go to the polls on 5 November to choose their next president.
US election results have sometimes been declared within hours of the polls closing, but this year’s tight contest could mean a longer wait.
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When is the 2024 presidential election result expected?
In some presidential races the victor has been named late on election night, or early the next morning. This time, the knife-edge race in many states could mean media outlets wait longer before projecting who has won.
Democrat Kamala Harris, the current vice-president, and Republican Donald Trump, the former president, have been running neck-and-neck for weeks.
Narrow victories could also mean recounts. In the key swing state of Pennsylvania, for example, a state-wide recount would be required if there’s a half-percentage-point difference between the votes cast for the winner and loser. In 2020, the margin was just over 1.1 percentage points.
0:53BBC’s Sumi Somaskanda explains when a new president will be announced
Legal challenges are also possible. More than 100 pre-election lawsuits have already been filed, including challenges to voter eligibility and voter roll management, by Republicans.
Other scenarios that could cause delays include any election-related disorder, particularly at polling locations.
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On the other hand, vote-counting has sped up in some areas, including the crucial state of Michigan, and far fewer votes will be cast by mail than in the last election, which was during the Covid pandemic.
When have previous presidential election results been announced?
The 2020 election took place on Tuesday 3 November. However, US TV networks did not declare Joe Biden the winner until late morning on Saturday 7 November, after the result in Pennsylvania became clearer.
In other recent elections, voters have had a much shorter wait.
In 2016, when Trump won the presidency, he was declared the winner shortly before 03:00 EST (08:00 GMT) the day after the election.
In 2012, when Barack Obama secured a second term, his victory was projected before midnight on polling day itself.
However, the 2000 election between George W Bush and Al Gore was a notable exception.
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The vote was held on 7 November, but the two campaigns went to war over a tight contest in Florida and the race was not decided until 12 December. The US Supreme Court voted to end the state’s recount process, which kept Bush in place as winner and handed him the White House.
What are the key states to watch in 2024?
Across the country, the first polls will close at 18:00 EST (23:00 GMT) on Tuesday evening and the last polls will close at 01:00 EST (06:00 GMT) early on Wednesday.
But this race is expected to come down to results from seven swing states. These are Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania and Wisconsin.
Polls close at different times in different regions. State-specific rules could prolong counting in some states, while other states may report partial figures moments after the last in-person vote is cast. Also, some absentee and mail-in ballots, including votes by members of the military and Americans living overseas, are normally among the last to be counted.
Georgia – Polls close in the Peach State at19:00 EST (00:00 GMT). Early and mail-in ballots will be counted first, ahead of in-person votes. Georgia’s top election official estimates that about 75% of votes will be counted within the first two hours, with a full tally possible expected by later in the night.
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North Carolina – Polls close thirty minutes after Georgia. North Carolina’s results are expected to be announced before the end of the night, however, complications may arise in areas that were hit by a hurricane in September.
Pennsylvania – Voting ends at 20:00 EST (01:00 GMT) in the Keystone State – the crown jewel of all the swing states in this election cycle. Like Wisconsin, Pennsylvania does not allow counting to begin until the morning of the election, leading to an expected delay in results. Experts agree that it may take at least 24 hours before enough votes are counted for a winner to emerge.
Michigan – Voting concludes at 21:00 EST (02:00 GMT) in the Wolverine State. Michigan allows officials to begin counting votes one week before election day, but they are not allowed to reveal the results until these polls shut. Michigan’s top election official has said that a result should not be expected until the “end of the day” on Wednesday.
Wisconsin – Results should come in shortly after polls close at 21:00 EST for smaller counties. However, it often takes longer for major populations centres to tabulate votes, leading experts to predict that the state won’t have a result until at least Wednesday.
Arizona – Initial results could come as early as22:00 EST (03:00 GMT), however, they won’t paint a complete picture. The state’s largest county says not to expect results until early Wednesday morning. On top of that, postal ballots dropped off on election day could take up to 13 days to count, according to officials in Maricopa County, the largest district in the state.
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Nevada – Votes here could also take days to count, because the state allows mail-in ballots to qualify as long as they were sent on election day and arrive no later than 9 November.