Evan McMullin, a former CIA analyst that ran against Trump as a Republican, says Comey's firing may compromise the investigation into Russian meddling in the US election.
- President Trump warns fired FBI chief Comey over media leaks
- Comey was leading inquiry into alleged Trump campaign-Russia ties
- President's account of their dinner conversation differs from people close to Comey
- Democrats call for an independent special prosecutor
Democractic Rep Elijah Cummings, the ranking member of the House Oversight Committee, has released a statement calling the involvement of Attorney General Jeff Sessions "mindboggling".
Sessions, a longtime ally of Trump, wrote to the president advising him to sack Comey.
Cummings called for emergency hearings in Congress.Copyright: BBC
Letter firing Comey was hand delivered to the FBI by longterm Trump aide Keith Schiller, CNN reports.
A letter from Deputy Attorney General Rod Rosenstein is scathing about Comey's handling of the Clinton email announcement, accusing him of releasing the information "gratuitously" and calling it a "textbook example of what federal prosecutors are taught not to do".
Ben Rhodes, former White House adviser to President Obama
Fox News presenter Sean Hannity
Senator Tim Kaine, Clinton's pick for vice-president
Former Clinton campaign manager Robbie Mook
Comey reportedly received the news in LA, where he was due to appear at a rare FBI recruiting event aimed at bolstering minorities and women among the ranks.
Here's the full statement, tweeted by White House press secretary Sean Spicer.
The BBC's Barbara Plett Usher broke the news to senior Republican Senator John McCain moments ago. Here's the full transcript of her interaction:
Plett Usher: The FBI Director Mr Comey has been fired.
McCain: He's what?
Plett Usher: He's been fired.
McCain: I did not know that.
Plett Usher: Do you have any reaction?
McCain: I'm sorry that that happened because I happen to have great respect for him. And I regret that that took place. The President does have that authority so I respect that.
Attorney General Jeff Sessions, a vocal supporter of Trump since the early stages of the campaign, wrote to the president advising him that "a fresh start is needed at the leadership of the FBI".
Comey was reportedly told the news by his staff, after a letter from President Trump said the director was "not able to effectively lead the Bureau" and it was "essential that we find new leadership".