"Based on our review, we have not changed our conclusions that we expressed in July with respect to Secretary Clinton," FBI Director James B Comey told Congress leaders in a letter.
The move, just before the general elections tomorrow, came as relief to the 69-year-old former secretary of state following the agency's announcement of launching a fresh probe into a cache of recently discovered emails that had triggered a backlash from the Democratic camp and dented Clinton's popularity.
A similar letter was sent to the Congress on July 28 in which Comey had said the FBI has reopened the investigation following discovery of some pertinent emails on the laptop of Clinton's close aide Huma Abedin which was shared by the latter's estranged husband Anthony Weiner.
"Since my letter (of October 28), the FBI investigation team has been working around the clock to process and review a large volume of emails from a device obtained in connection with an unrelated criminal investigation," Comey said. It was reported that there were 650,000 emails on that laptop.
The FBI's letter was welcomed by the Clinton campaign, which saw its popularity graph sharply dropping down in the aftermath of the October 28 letter.
"We were always confident nothing would cause the July decision to be revisited. Now Director Comey has confirmed it," tweeted Clinton spokesman Brian Fallon.
"We are glad to see that he has found, as we were confident that he would, that he had confirmed the conclusions he reached in July and we are glad that this matter is resolved," Jennifer Palmieri, Clinton's communications director, told reporters.
Trump challenged the FBI's statement, saying: "You can't review 650,000 emails in eight days."
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In her address at Cleveland, Clinton said: "I want to really look at the faces of the people in front of me. I don't know your dreams, I don't know your struggles, but I want so much to convey to you that I will be on your side. I will never, ever quit on you."
Senator Dianne Feinstein in a statement said the FBI's letter should end the email saga once and for all.
Democratic leader Nancy Pelosi said that after yet another exhaustive review of emails to and from Clinton, the FBI has again given her a clean bill of health.
"While the original letter allowed days of innuendo and falsehood by Republicans desperate to divert attention from themselves, the FBI's swift and thorough review should finally close the door on this Republican sideshow.
Disagreed, said the Republican National Committee (RNC) chairman Reince Priebus.
"The FBI's findings from its criminal investigation of Hillary Clinton's secret email server were a damning and unprecedented indictment of her judgment. The FBI found evidence Clinton broke the law, that she placed highly classified national security information at risk and repeatedly lied to the American people about her reckless conduct," he said.
Senate Minority leader Harry Reid said Comey created a political firestorm 11 days before a presidential election merely to confirm what people already knew: that Clinton's email practices were legal.
"Director Comey's actions were contrary to Justice Department rules and longstanding practice, and may have violated the Hatch Act. By confirming that the new emails were meaningless, today's letter underscores the irresponsibility of Director Comey's original letter," he said.
