Republicans and Democrats demand embattled director is investigated after letting Clinton off the hook just eight days following dramatic announcement of second email probe

FBI director James Comey is under increasing pressure from both Republicans and Democrats to explain his actions over the past eight days after announcing the bureau's latest probe into Hillary Clinton's private server wouldn't lead to criminal charges. 

Comey rocked the Democratic boat 11 days before the election when the FBI decided to investigate additional emails in the case.

The letter in which he announced his bureau hadn't reached different conclusions than when it probed the case in July came just two days before Election Day.

Senator Al Franken on Sunday called for Comey to stand before the Senate Judiciary Committee - and was joined in the charge against Comey by fellow Senator Dianne Feinstein.

'I think that there should be hearings, and I'm certain there will be hearings in the Judiciary Committee on this matter,' Franken said on CNN's 'State of the Union'.

'We will have hearings. I'm sure that FBI Director Comey will be before us,' Franken added.

'I think he should be able to answer questions about this, and he should be able to control the FBI.' 

Franken belongs to the Minnesota Democratic–Farmer–Labor Party, an affiliate of the Democratic Party.

Feinstein, a member of the Senate Judiciary Committee and a Democrat, said Sunday that Comey's initial letter 'unfairly hurt' Clinton's campaign and 'changed the tenor' of the election.

'Today's letter makes Director Comey's actions nine days ago even more troubling. There's no doubt that it created a false impression about the nature of the agency's inquiry,' Feinstein wrote.

 Hillary Clinton is guilty. She knows it, the FBI knows it, the people know

Donald Trump in Detroit, Michigan 

'I believe the Justice Department needs to take a look at its procedures to prevent similar actions that could influence future elections.

'Now that this matter is concluded, I hope that the final days of the campaign allow the American people an opportunity to consider the important issues facing our country.'

The FBI decided in October to probe emails encountered during a search of former congressman's Anthony Weiner's laptop.

Trump attacked Comey's decision during a rally in an airport hangar in Minneapolis. He said the entire electoral system of being rigged against him. 

He said: 'This is a whole different ballgame.' 

During the rally in Detroit - which has been a Democrat stronghold since 1976 - he said: 'Hillary Clinton is guilty. She knows it, the FBI knows it, the people know. And now it's up to the American people to deliver justice at the ballot box on November 8th.'

Trump also received the strong backing of House Speaker Paul Ryan, who urged voters to support the billionaire businessman.

He called on people to 'bring the Clinton era to an end'. 

'Regardless of this decision, the undisputed finding of the FBI's investigation is that Secretary Clinton put our nation's secrets at risk and in doing so compromised our national security.

'She simply believes she's above the law and always plays by her own rules. 

'This is a pattern with the Clintons, and the American people should not have to endure four more years of their scandal and baggage.  

'Fortunately, the American people have the opportunity to ensure Secretary Clinton never gets her hands on classified information again.

'Let's bring the Clinton era to an end by voting for Donald Trump on Tuesday.' 

Chairman of the Republican National Committee Reince Priebus said: '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. '

Former House Speaker and current Donald Trump supporter New Gingrich bashed Comey and accused him of caving.

Trump himself slammed the FBI's latest announcement, claiming it was impossible to review 650,000 emails in eight days.

'Comey must be under enormous political pressure to cave like this and announce something he cant possibly know,' Gingrich wrote in a tweet Sunday.

'The destruction of James Comey by political pressure is painful to watch,' Gingrich added. 'He is being twisted into an indefensible pretzel of contradictions.'