The United States’ Federal Bureau of Investigation, FBI, has once again exonerated Hilary Clinton of any crime with regards to the latest scrutiny of a new set of emails linked to the former secretary of state.

FBI director, James Comey, in a letter to the US congress on Sunday, stated that a fresh inquiry into the Democratic candidate’s communications found nothing to change the bureau’s conclusion earlier in the summer.

However, Donald Trump has cried foul, accusing the FBI of impropriety and claiming it was impossible for the agency to have scrutinized 650,000 emails in just eight days.

“Right now she’s being protected by a rigged system. It’s a totally rigged system. I’ve been saying it for a long time,” he told supporters in Sterling Heights, Michigan.

“Hillary Clinton is guilty, she knows it, the FBI knows it, the people know it and now it’s up to the American people to deliver justice at the ballot box on November 8,” he added.

The Clinton campaign, however said it was “glad” the lingering issue had been resolved.

The dramatic twist lifted a cloud from the former US first lady’s campaign as the final day of the marathon US election race loomed.

Latest opinion polls on Sunday, before news broke of the FBI announcement, gave Clinton a four to five-point lead over Trump.

While Clinton herself did not address the FBI director’s letter on the trail, her campaign said it was always confident she would be cleared.

In Manchester, New Hampshire, on Sunday, she said the country was facing “a moment of reckoning” and Americans must choose between “division and unity”.

Recall that in July, the FBI said Clinton had been “extremely careless” to handle classified material on a private email server as secretary of state from 2009-13, but it had found no evidence she committed a crime.

However, 11 days before the election, FBI director James Comey pitched the presidential race into turmoil by announcing a newly discovered batch of Clinton emails would be investigated.

The bombshell infuriated the Clinton camp, but threw a lifeline to a Trump campaign that had been receding in the polls.

Both candidates are set for a tour of battleground states on Monday, in a last-ditch dash for votes.

Clinton starts the day in Michigan, a traditional Rust Belt, Democratic stronghold that has been heavily targeted by Trump in recent days.

She will then head to Philadelphia where she will be joined by President Barack Obama, First Lady Michelle Obama and husband Bill Clinton.