The FBI has intervened in the US presidential election again, releasing a 17-year-old archive of documents from a long-closed investigation into Bill Clinton's presidential pardon of a fugitive financier.
The release comes a week before the presidential election and amid the bureau's controversially timed review of emails from a Hillary Clinton aide.
The 129 pages of heavily censored material have been published on the FBI's Freedom of Information Act webpage.
FBI officials say the documents had been requested under the federal records law.
The documents describe the FBI's investigation into Bill Clinton's pardon of Marc Rich, who was indicted in 1983 and lived in Switzerland. The case was closed in 2005 without federal charges. Rich died in 2013.
The files briefly cite the Clinton Foundation in connection with a large donation in support of Clinton's presidential library.
On the campaign trail, Hillary Clinton reminded swing state voters today what they may dislike about Donald Trump.
Her GOP rival homed in on the FBI's renewed examination of her emails and the rising premiums for "Obamacare," capitalising on late-breaking political ammunition.
Campaigning in Pennsylvania, a state where some health care premiums are expected to go up by more than 40 per cent, Trump made a joint appearance with running-mate Mike Pence to present their healthcare proposal.
Striking a subdued tone and barely mentioning Clinton's name, the typically fiery Republican still warned that electing Clinton would "destroy American healthcare forever".
Trump said: "Obamacare has led to higher prices, fewer choices and lower quality. Hillary Clinton wants to expand Obamacare and make it even more expensive."
If elected, he promised to immediately convene a special session of Congress to repeal the law. It's unclear what that meant, since Congress is already scheduled to be in session several weeks before the new president is inaugurated.
While the fresh opportunities reinforce years of Republican attacks, they may be too little and too late to help Trump: As Clinton's national lead shrinks in the final week of the race, she is relying on a firewall of support from women and minority voters in demographically diverse swing states.
In rallies across Florida, Clinton planned to hit hard at the treatment of women by Trump, who has been accused of repeatedly sexually harassing and even assaulting them.
She will be introduced by Alicia Machado, the winner of Trump's 1996 Miss Universe crown whom he has repeatedly insulted for her weight gain.
Clinton aides acknowledge that the race has tightened in recent days but also say Trump had begun gaining ground in the days before FBI Director James Comey sent a letter to Congress at the weekend announcing the agency's renewed interest in her emails.
In the past 72 hours, Clinton has raised US$11.3 million online, the most since she became the nominee - indicating that the email issue is rallying supporters.
"The race has tightened in a way we thought it would tighten, but we do not see anything that would suggest that that FBI story is impacting it," said campaign manager Jennifer Palmieri.
She said the campaign believes "we have a relatively substantial national lead".
With more than 23 million ballots already cast through early voting, Trump simply may not have the time or organisational capacity to improve his standing enough over the next week to win the White House.
The Republican nominee still faces a narrow pathway to winning the 270 electoral votes - one that includes defending states like Arizona and Utah that Republicans have won for decades.
Even as the White House remains an uphill climb, the new developments had potential to help embattled Republicans as they struggle to defend their Senate majority.
Both sides agree the news puts Democratic down-ticket candidates on the defensive, at least briefly.
It comes after weeks where Democrats have rarely had to answer for their party's nominee, while Republicans have been doing so practically constantly.
But neither Republicans nor Democrats view the news as a game-changer in the race for Senate control.
Democrats remain optimistic they will pick up the four or five seats needed to retake control, while Republicans concede they are in a real race to keep the majority.
Clinton's campaign has spent nearly two years developing an extensive organising apparatus, building off the political machine that twice boosted President Barack Obama to victory.
Her team has pounded the airwaves with advertising, assembled an expansive voter data file and constructed a nationwide political organisation that dwarfs her opponent's.
Today, it released a new ad featuring video footage of Trump making sexist and degrading statements about women.
"Anyone who does what he does is unfit to be president," reads text on the final shot of the spot, which her campaign says will run in eight battleground states.
RCP national poll average
Hillary Clinton 47.5 (+2.2)
Donald Trump 45.3
270 votes needed to win election
259 safe Clinton (leads by +5)
164 safe Trump (leads by +5)
New Hampshire +4.7
Colorado +4, 9 EC
North Carolina +2, 15 EC votes
Nevada +1, 6 EC votes
Arizona +0.6, 11 EC votes
Florida + 1, 29 EC votes
Iowa +1.4, 6 EC votes
Ohio +2.5, 18 EC votes
Georgia +4, 16 EC votes
Today - Florida
Tomorrow - Arizona
Friday - North Carolina
Today - Pennsylvania, Wisconsin
Tomorrow - FloridaFriday - Florida, Pennsylvania, North Carolina
Her campaign also announced that it will spend more than US$100,000 on TV commercials in Democratic Michigan and New Mexico, a development that comes shortly after Trump's campaign announced it would be advertising there.
Clinton's team earlier confirmed it will be advertising in Colorado for the first time since July. And it also is deploying ads in Virginia for the first time since early August.
The Democratic presidential nominee and her allies in a dozen battleground states have more than 4800 people knocking on doors, making phone calls and otherwise working to support her candidacy.The New York businessman over the past year has instead depended on massive rallies and free media coverage to drive his outsider candidacy.
This week, he's devoting his most valuable resource - his time - to states where polls suggest he's trailing Clinton by significant margins. Trump had two rallies in Michigan, a state that last went for a Republican presidential nominee in 1988.
He's scheduled to appear with Pence in Wisconsin, which hasn't backed a Republican for president since 1984.