President Donald Trump has again called former FBI director James Comey a "slimeball" ahead of the publication of his new book.

US President Donald Trump has labelled former FBI director James Comey an "untruthful slime ball" in his latest Twitter outburst.

US president Donald Trump has accused the FBI and the justice department of bias over the Russian election meddling probe.

President Donald Trump has attacked the FBI leadership while proclaiming loyalty and support for law enforcement in an address at the agency's training academy.

President Donald Trump has denied asking former FBI director James Comey to stop investigating his ex-national security adviser Michael Flynn.

JOHN Mindermann is part of an unusual fraternity. A former agent with the Federal Bureau of Investigation (FBI), now 80 and retired in his hometown, San Francisco, he is among the relative handful of law-enforcement officials who have investigated a sitting president of the US.

US President Donald Trump has suggested he was just trying to keep fired FBI director James Comey honest with his cryptic tweet implying there might be recordings of their private conversations.

Fellow Republicans are pressing President Donald Trump to come clean about whether he has tapes of private conversations with former FBI director James Comey.

US President Donald Trump has said he's "100%" willing to testify under oath about his interactions with fired FBI director James Comey.

LATEST: Donald Trump's personal lawyer says the president "never, in form or substance" directed former FBI director James Comey to stop investigating anyone.

US President Donald Trump told Russian officials at a meeting last week that James Comey was a "nut job" whose removal as FBI director relieved "great pressure" on him, according to The New York Times.

US President Donald Trump has tweeted that former FBI director James Comey "better hope" that there are no "tapes" of their talks.

President Donald Trump has contradicted previous White House explanations for the firing of James Comey as FBI director.

A farewell letter from James Comey that has circulated among friends and colleagues says he does not plan to dwell on Donald Trump's decision to fire him or on "the way it was executed".

James Comey told politicians days before he was sacked that he had asked the Justice Department for more resources to pursue the FBI's investigation into Russia's interference in last year's presidential election, three US officials have said.

US President Donald Trump has "terminated" FBI director James Comey with the top US law enforcement official ousted while he was speaking to agents.

The head of the FBI has denied there is any truth to series of tweets from Mr Trump which declared the Republican candidate's phones had been ordered tapped by then-president Barack Obama during the campaign.