Image source, Getty Images

Trump is barn-storming the crucial swing state of Florida today, with three rallies in Miami, Orlando and Pensacola.

Hillary Clinton campaigns in Las Vegas, Nevada, this evening and then moves to the red state of Arizona for a rally at Arizona State University.

President Obama holds a rally in Raleigh, North Carolina, in the afternoon before he flies to Miami where he'll stay overnight for more campaigning tomorrow.

Clinton's vice-presidential pick, Tim Kaine, is holding two rallies in Des Moines, where two police officers have just been killed in an ambush.

Trump's running mate, Mike Pence, has three rallies in three different states out west. He starts the day in Arizona, then hopscotches to New Mexico and Colorado.

VP Joe Biden is also on the campaign trail in Tampa and Palm Beach, Florida, where he is visiting a museum and a university.

Emily Maitlis
Newsnight Presenter

The BBC's Emily Maitlis has been dissecting the latest poll from ABC, which has found the race narrowing, particularly in the swing states.

The poll of 1,182 likely voters finds that in the toss-up states (ABC designates Arizona, Florida, North Carolina, Ohio and Utah in this bracket) voters split 41% Clinton to 48% Trump.  

Trump appears to be gaining ground with "those leaning towards Republican", and he has seen his standing improve among pure independents (who are affiliated to neither party), according to the poll which was conducted by phone between 28-31 October.

Among those who call themselves Democrat or Democratic-leaning, Mr Trump's support has gone from 5% to 9%. Mrs Clinton is supported by just 6% of Republican-leaning voters.

Read Emily's blog to understand the latest data

Investors are increasingly focusing on the presidential race as polls tighten following last week's news that the FBI had opened a new investigation into Clinton's private email server. The narrowing in the race has brought more uncertainty. 

Shares fell in Europe and Asia on Wednesday, and the dollar has weakened.

"It was always likely that investors were going to be cautious in the lead up to next week's US election," said Ric Spooner, chief market analyst at CMC Markets. 

"However, with polls suggesting that Donald Trump's prospects are improving that caution is translating into nervousness."

Image source, Getty Images

Remember the uproar over Donald Trump buying a portrait of himself with money from his charity, the Donald J Trump foundation? The artist has now tweeted an image, so take a look to see what he got for his money:

More than 20 million Americans have already voted - a full six days before election day.

Here is what we know about those votes so far:

• Early voting data suggests a dip in turnout by African-American voters, but a rise in Hispanic voters and college-educated women
• Absentee ballot, postal voting, but also an in-person vote at a polling booth are all means of early voting, the rules vary state by state
• At least four states allow voters to change or cancel their early ballots, including battlegrounds Michigan, Pennsylvania and Wisconsin.
• This prompted Donald Trump to urge those who already voted for Hillary to recast their ballot
• In Wisconsin, voters are allowed to change their vote three times
• About a third of all voters participated early in 2012, but this number is expected to be higher this year

Image source, AP

The race is on to get to voters in battleground states. 

Donald Trump will take to the stage at several places in Florida - Miami, Orlando, and Pensacola.

Hillary Clinton, who was in Florida on Tuesday, will move to Arizona and Nevada.

With six days to go until election day, here is a recap of what has happened over the past few hours:

• Six days left in the US presidential contest, and opinion polls appear to show the race getting tighter
• The prospect of a Trump presidency has sent world markets tumbling - appearing to confirm some analysts' view that the markets believe a Clinton victory would bring more stability for the US economy
• The US dollar has weakened, and safe haven assets like gold and the Swiss franc are up
• Democratic nominee Hillary Clinton has stepped up her attacks on rival Donald Trump, labelling him a "bully" for criticising women for their looks
• Mr Trump has branded Mrs Clinton "corrupt" and said she would "destroy American healthcare forever"

A reminder of what happened on Tuesday as we bring the live page to a close:

• Hillary Clinton stepped up her attacks on rival Donald Trump, labelling him a "bully" for criticising women for their looks and saying he had a 30-year history of "demeaning, degrading, insulting and assaulting" women
• Mr Trump branded Mrs Clinton "corrupt" and said she would "destroy American healthcare forever". He also urged early voters with "buyer's remorse" to change their vote 
• The FBI unexpectedly released 129 pages of documents related to a 2001 investigation into Bill Clinton - the Clinton team raised questions about timing of the dump
• New ABC poll suggested Trump has a one-point lead nationwide, 46% to 45%

A fall in the price of the dollar to a three-week low against the yen and the euro was blamed by traders on uncertainty caused by opinion polls showing Donald Trump had gained ground on Hillary Clinton.

 "While Clinton may still hold a lead over Trump, the dollar could suffer another round of declines if new polls show Trump catching up," Shin Kadota, chief Japan FX strategist at Barclays in Tokyo told Associated Press. 

At the same time, the price of gold, a traditional safe haven for investors, rose to a four week high. 

Donald Trump is urging early voters who have had second thoughts about Hillary Clinton to recall their ballots.

The Republican nominee - who is hoping the ongoing controversy about Clinton's emails will swing the presidential election in his favour - said Clinton voters with "buyer's remorse" could change their ballots at a county clerk's office.

Speaking at a rally in Wisconsin, Trump said it was one of four states that allow early ballots to be changed. The other three are Michigan, Minnesota and Pennsylvania.

In Wisconsin, voters can change their minds up to three times. The deadline for doing so is Thursday.

Changing votes is very rarely done, according to the Early Voting Information Center at Reed College. 

Image source, Getty Images

Time is rapidly running out for Donald Trump to release his tax returns, but that has not stopped Hillary Clinton from continuing to push him, telling a rally in Florida he has "no excuse".

The Democratic nominee says she's particularly interested in learning about any dealings Trump has had with Russian interests and whether he contributed to charity. 

Trump has said he can't release his tax returns - in line with the usual custom for presidential candidates - because they are being audited, but even if he did they would not reveal very much.

Clinton has dismissed both of those arguments. She attacked her rival at tonight's rally as the "poster boy for everything that is wrong with our economy".

Laura Trevelyan
Presenter, BBC World News America

The final days of this campaign are devoid of the uplifting closing arguments which presidential contenders usually deploy. 

Instead, negativity and character attacks are routine. 

With opinion polls suggesting either a narrowing lead for Hillary Clinton or a dead heat, the democratic contender was in the crucial swing state of Florida, for her fourteenth visit in a week. 

Mrs Clinton is trying to remind female voters of Mr Trump's degrading remarks about women. 

She's launched an ad using his lewd comments, and on Tuesday she campaigned with Alicia Machado, the beauty queen who Donald Trump said should lose weight and described as Miss Piggy. 

For his part, Mr Trump was in the all-important Pennsylvania suburbs, where he was scathing in his attacks on President Obama's reform of healthcare, promising to repeal and reform what he called the destructive law. 

Though the race appears to be tightening in the wake of the FBI's decision to look at new emails relating to their investigation of Mrs Clinton, Democrats have an advantage in the electoral map - while Donald Trump has fewer paths to the crucial 270 votes required to win the presidency

President Barack Obama appeals to working-class voters not to be "bamboozled" by Donald Trump, saying he has "shown no regard for working people". The Republican candidate "wouldn't let you into one of his hotels unless you were cleaning the room," he tells an audience in Ohio, a state he won twice by winning just enough working-class voters.