FBI agent Robert Levinson disappeared in Iran under mysterious circumstances more than a decade ago.
Former Trump White adviser Steve Bannon had suggested in a Facebook video that FBI Director Christopher Wray and government infectious diseases expert Anthony Fauci should be beheaded for being disloyal to Trump.
The FBI says agents were working to investigate "a suspicious letter received at a US government mail facility."
The US president attacked the intelligence chief over his focus on white supremacist groups as the biggest threat of domestic violence.
The Florida man suspected of mailing at least 14 pipe bombs to some of US President Donald Trump's leading critics was in custody on federal charges on Saturday, in a case reflecting the rancor of one of the most toxic election campaigns in decades.
US President Donald Trump comforts Florida massacre survivors as anger mounts over the FBI's failure to stop the attack despite a solid tip about Nikolas Cruz who killed 17 people in a high school rampage.
The Democrats' memo aimed to counter a Republican-drafted one that the president declassified which alleged anti-Trump bias in the FBI’s Russia probe.
"A lot of people should be ashamed," says US President Donald Trump after okaying release of the memo denouncing an FBI probe over his campaign's ties with Russia. And Democrats warn of a "constitutional crisis" if Trump fires the head of the probe.
Despite strong objections from his own administration, US President Donald Trump is set to approve publication of a secret memo alleging abuse of power in the FBI's probe of his election campaign.
Andrew McCabe, criticised by President Donald Trump for alleged bias against him, steps down as the agency's No 2 official. Sources say McCabe was leaving the bureau effective immediately.
The announcement comes almost a month after US President Donald Trump fired FBI director James Comey, who was overseeing an investigation into possible links between Russia and Trump's election campaign.
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