The Democratic and Republican candidates are neck-and-neck in the presidential race as Americans go to the polls today.
The former First Lady is now five points ahead of Trump, at 48% to 43%, according to the latest ABC News/Washington Post poll.
Last week the same poll found that the Republican billionaire had surged ahead to 46%, just a point ahead of Clinton at 45%.
A national poll average, from Real Clear Politics (RCP), puts the former First Lady at 46.8%, compared to 43.6% for Trump.
Clinton's clear lead evaporated after the FBI found more emails which might have been relevant to her use of a private email server.
The FBI has now cleared Clinton of any criminality after agents examined up to 650,000 new emails over the past week.
Trump is once again making allegations that the FBI is protecting Clinton because the system is "rigged" against him.
In late October Mrs Clinton had a staggering 14-point lead over Mr Trump, according to an Associated Press-GfK poll.
But the FBI email scandal diverted attention away from a series of sexual assault allegations against Trump - all of which he has denied.
The Republican has now regained the lead in a Californian poll, from USC Dornsife/LA Times. He is now at 46.8%, well above 43.6% for Clinton.
The former First Lady previously surged ahead in the national polls after giving polished performances in the presidential debates.
Before the first debate Trump was at 43%, just above Mrs Clinton's 41%, according to a four-way Bloomberg poll.
Clinton's hopes of an easy victory were dashed by the FBI announcement about her emails at the end of last month.
It comes after voters had deserted Trump due to his obscene remarks about groping women in a 2005 audio.
The release of the recording coincided with Clinton's strong performance in the TV presidential debates.
This allowed the Democratic campaign to rebound after she previously lost momentum amid conspiracy theories over her health.
Trump got a boost in the polls following her collapse at a 9/11 memorial because he has always claimed that she lacks the "stamina" to lead America.
After a difficult summer on the campaign trail, Mr Trump was forced to apologise for his most extreme outbursts.
For example, he suggested that gun activists could take matters into their own hands if Clinton moves to weaken gun laws.
He also launched a widely-criticised attack on the parents of slain Muslim American soldier Captain Humayun Khan.
In an unprecedented move, Barack Obama slammed Mr Trump as "unfit" to be President and called on Republican leaders to withdraw their endorsement.
Clinton took a six-point lead at the end of July in the wake of the Democratic National Convention, according to a Reuters/Ipsos poll.
Mr Trump was briefly ahead in the polls following the Republican National Convention but Clinton has solidly outpaced him for most of the race.
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