Mueller, a former FBI director who was named special counsel for the Russian Federation investigation after Comey was sacked, is investigating whether the Trump campaign colluded with Kremlin officials in a bid to tilt the 2016 election in his favour.
Mr Robert Mueller, the special counsel named by the department to investigate the Russian Federation matter, is now examining whether Mr Trump or others sought to obstruct the probe, a person familiar with the inquiry said on Thursday.
Trump appeared to be responding to reports this week that the FBI is investigating Trump's decision to fire FBI Director James Comey and his apparent attempts to quash the bureau's investigation of former National Security Adviser Michael Flynn.
"After 7 months of investigations and committee hearings about my "collusion with the Russians", nobody has been able to show any proof".
Comey was sacked on 9 May, and initially the White House cited his handling of the investigation into Hillary Clinton's private email server as the reason for his termination, releasing a memo authored by deputy attorney general Rod Rosenstein as a basis for this action.
The Washington Post reported June 15 that Mueller was expanding his investigation to include potential obstruction of justice charges for Trump during his conversations with Comey. Acting Attorney General Rod Rosenstein appointed Mueller in May to lead the probe.
The president complained the probe is unfair and wondered why his defeated Democratic opponent wasn't getting the same scrutiny. Trump wrote on Twitter.
Vice President Mike Pence has also hired a private lawyer to represent his interests in the expanding probe.
Cosby thanks supporters on Twitter as trial deliberations continue
Wyatt said he believed a chat with the couple and their 14-year-old son and 9-year-old daughter would brighten Cosby's spirits. The judge directed them to keep talking and as Thursday evening fell, the panel of seven men and five women were still at it.
He had likened the appointment of the special counsel with the "single greatest witch hunt of a politician in American history".
Mr Pence's office confirmed he had retained Richard Cullen, a former Virginia attorney general and USA attorney for the Eastern District of Virginia, to assist "in responding to inquiries" from Mr Mueller.
Mark Corallo, spokesman for Trump's personal lawyer, Marc Kasowitz, said earlier this week that, "The FBI leak of information regarding the president is outrageous, inexcusable, and illegal".
The appointment was hailed by partisans on both sides of the aisle, who praised Mueller as a model law enforcement official and an aggressive, yet fair, investigator.
Donald Trump has reportedly been yelling at TV sets in the White House as he becomes "increasingly angry" about an investigation into alleged Russian meddling in the U.S. presidential election. However, Trump later told NBC News' Lester Holt that he had already chose to fire Comey before that memo was written.
The US leader thinks he is the victim of a conspiracy aimed at discrediting his leadership and ending his time in the White House, according to the Associated Press.
Trump hadn't publicly admitted he was personally under investigation until now.
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