Polls showed the US election tightening Sunday as Hillary Clinton campaigned in the crucial state of Florida, grappling with the fallout from the FBI director disclosing more of her emails were under review.
With the US elections now just nine days away, an ABC News/Washington Post poll put the former secretary of state just one point ahead of her bombastic Republican challenger, Donald Trump, at 46-45 percent of likely voters in a four-way race.
In Florida, which is a must-win if Trump is to have any hope of victory, the tycoon overcame a one-point deficit to lead, according to a New York Times Upshot/Siena College Research Institute poll.
The poll gave Trump 46 percent of likely voters compared to Clinton's 42 percent, with former governor Gary Johnson dropping to four percent and Green Party candidate Jill Stein on two percent.
While the 69-year-old former first lady looking to make history as America's first female commander-in-chief is still overwhelmingly expected to win the November 8 ballot, Trump was quick to crow Sunday.
"We are now leading in many polls, and many of these were taken before the criminal investigation announcement on Friday - great in states!" the 70-year-old real estate tycoon tweeted to his followers.
Clinton is in Florida a second day Sunday after addressing thousands of supporters at a Jennifer Lopez concert in Miami and calling the FBI director's move "deeply troubling" on Saturday.
FBI boss James Comey wrote to lawmakers on Friday, announcing that his agents are reviewing a newly discovered trove of emails, resurrecting an issue that the Clinton campaign thought was behind it.
"It was long on innuendo, short on facts, so we're calling on Mr Comey to come forward and explain what's at issue here," Clinton's campaign chairman John Podesta told CNN Sunday, referring to Comey's announcement.
"It's unprecedented and it is deeply troubling because voters deserve to get full and complete facts," Clinton said in Florida on Saturday.
"So we've called on Director Comey to explain everything right away, put it all out on the table, right?" she declared, to rapturous cheers.
Leading Democratic senators have also written to Comey and his boss, Attorney General Loretta Lynch, urging them to make clear by Monday night whether the new emails are pertinent to the investigation into Clinton's handling of classified material that the FBI closed in July.
But the Trump campaign - itself reeling from scandal over alleged sexual misconduct accusations against the tycoon from at least 12 women - has been eager to exploit the FBI's decision.
"You see the polls closing in states around the country," his running mate Mike Pence told NBC's "Meet the Press" on Sunday.
"The American people are focusing on the big issues in this country. Frankly, I think they have come to the conclusion that Hillary Clinton is a risky choice to be the next president of the United States."
Campaign manager Kellyanne Conway lashed out at Clinton, assailing her for going after Comey.
"She just has to call her friend and confidante, Huma Abedin and say tell us what's in the emails, tell us what's on the devices that you shared with your pedophile husband," she told Fox News.
"I think it's a terrible strategy but it's very much the strategy of Hillary Clinton throughout her career which is to shoot the messenger, attack the person who's calling into question your fitness for office."