President Donald Trump blasted the FBI Saturday, insisting it acted "for no reason & with no proof" when it opened an investigation into whether he was acting on Russia's behalf after he fired the agency's director, James Comey, in May 2017.

George Papadopoulos was the second person ordered to prison in the sprawling, 16-month Russia collusion investigation of Special Counsel Robert Mueller.

The FBI believed that a former campaign advisor to Donald Trump was "collaborating" with Russia as it worked to influence the 2016 presidential election, top secret documents released to US news organizations have revealed.

James Comey was fired in May 2017 over what the Justice Department said was his handling of the FBI investigation into 2016 Democratic presidential candidate Hillary Clinton.

FBI officials arrested a man who discussed setting off a bomb during Fourth of July celebrations in Cleveland, the bureau's top agent in the Ohio city said on Monday.

Fired former FBI chief James Comey lashed out at Donald Trump in an interview with ABC broadcast Sunday, calling him "morally unfit" to be president and describing him as a serial liar who will "stain everyone around him."

James Comey's book, which is scheduled to be released on Tuesday, was the subject of five of eight tweets sent by the president on Sunday morning.

His Highness the Deputy Emir Sheikh Abdullah bin Hamad al-Thani met at his Emiri Diwan office with the visiting Director of the US Federal Bureau of Investigation (FBI), Christopher Wray, and his accompanying delegation.

US President Donald Trump attacked former FBI Director James Comey on Friday as a "weak and untruthful slime ball," reacting to news accounts that cited Comey as searingly critical of the president in a memoir due to be published next week.

US President Donald Trump slammed the FBI for failing to heed signs that could have prevented the Florida school shooting, charging the agency was too preoccupied with probing his campaign team over Russian election meddling.

US counterintelligence officials warned President Donald Trump's son-in-law Jared Kushner in early 2017 that Chinese-American businesswoman Wendi Deng Murdoch might be using their friendship to benefit Chinese government interests, The Wall Street Journal reported Monday.

Paul Manafort surrendered to the FBI and another ex-aide pleaded guilty to lying to agents in the most serious steps yet of a federal probe into Russian meddling in the 2016 presidential election.