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Donald Trump has hit out at the FBI, accusing the agency of impropriety for declaring that his rival Hillary Clinton should not face criminal charges.

The candidates are entering their final full day of campaigning after FBI director James Comey announced that the Democratic hopeful was in the clear over her handling of classified information while US secretary of state.

Comey's announcement, just two days before Tuesday's election, was a welcome relief to the Clinton campaign after the investigation threatened to derail her lead over her Republican rival.

But Trump said: "Hillary Clinton is guilty. She knows it. The FBI knows it. The people know it."

(Image: REUTERS/Carlo Allegri)

In a letter to members of Congress, Comey said the bureau had finished its review and found nothing to change its previous position.

Four months ago he said Clinton had been careless but not criminal in handling classified material on her private email server while secretary of state.

(Image: Getty Images)

A fortnight ago she suffered a huge drop in her ratings putting her neck-and-neck with Donald Trump after the FBI reopened their investigation after finding 650,0000 emails on her aide, Huma Abedin's laptop.

The computer was seized by investigators probing her husband, former politician Anthony Weiner, following claims he sexted an underage girl.

The emails were understood to stretch back years and were on a laptop both Weiner and Abedin used and that hadn’t previously been searched in the earlier Clinton probe.

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“I write to supplement my October 28, 2016 letter that notified you the FBI would be taking additional investigative steps with respect to former Secretary of State Clinton's use of a personal email server,” said Mr Comey in a letter to Congress today.

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“Since my letter, the FBI investigative 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.

“During that process, we reviewed all of the communications that were to or from Hillary Clinton while she was Secretary of State.

"Based on our review, we have not changed our conclusions that we expressed in July with respect to Secretary Clinton.”

At a rally in Michigan, Trump questioned the thoroughness of the FBI review and said he was confident the issue would not go away.

He told supporters: "The investigation will go on, the rank-and-file special agents won't let her get away with her terrible crimes."

How Did The Email Scandal Start?

(Image: Getty Images)

While she was Secretary of State, Hillary Clinton kept her own email server in her home in Chappaqua, New York.

She had an official state.gov email address, but she never used it, she says because it would have involved having to carry two Smartphones around - one of them a ‘secure’ government model.

Instead, all of her personal and work correspondence was filtered into her home email address - hdr22@clintonemail.com

Sceptics claim it had nothing to do with convenience, and she just wanted to be sure that all of her correspondence was exempt from Freedom of information laws.

She also set up addresses on the server for aides including Chief of staff Cheryl Mills and long-time aide Huma Abedin.

Click here for our full guide to the Hillary Clinton email scandal.