"That's taken off", Trump allegedly said. "I'm not under investigation".
The person is a senior White House adviser "close to the president", but the unnamed sources would not identify that official, the Post reported.
Friday's report quotes Trump calling ousted Federal Bureau of Investigation director Comey "crazy" and "a real nut job".
Comey was leading the probe into alleged Russian meddling in the 2016 USA election and possible ties to Trump's campaign. "We are confident that when these inquiries are complete there will be no evidence to support any collusion between the (Trump) campaign and Russian Federation", an official said in a statement to CNN.
"I think the Flynn thing is where the president is very vulnerable personally", Pelosi told The Associated Press in an interview in her office. A memo reportedly written by Comey was subsequently leaked, and it revealed that the president had asked Comey to end the investigation into former national security adviser Michael Flynn's ties to Russian Federation.
"By grandstanding and politicising the investigation into Russia's actions, James Comey created unnecessary pressure on our ability to engage and negotiate with Russia", Spicer said. This week, Trump called the investigations a "witch hunt," in addition to releasing an official statement saying he looks forward to the "matter concluding quickly". Richard Burr, and the ranking Democrat, Sen.
Comey, however, turned down an invitation to testify publicly before the Senate Judiciary Committee as well, which left chairman Chuck Grassley, R-Iowa, and Dianne Feinstein, D-Calif., "extremely disappointed", the lawmakers said in a statement Friday evening.
Mr Comey's dismissal last week set off a series of jarring developments that culminated on Wednesday in the Justice Department's appointment of a special counsel to probe possible ties between Russian Federation and Mr Trump's 2016 presidential campaign.
The elder Comey's remarks were published shortly after reports came out about how Trump bashed his son when he hosted Russian officials at the White House last week.
"There is no collusion between certainly myself and my campaign, but I can always speak for myself, and the Russians - zero", Trump told reporters.
The worldwide trip, which includes stops in the Middle East and Europe, comes at an opportune time for the White House, which has endured a week full of bombshell news stories that threaten to engulf the administration.
"No, the president had lost - again, like I said - he'd lost confidence in Director Comey, and frankly, he'd been considering letting Director Comey go since the day he was elected", Sanders responded. The Committee will schedule the open hearing after Memorial Day.
On Wednesday, the US Department of Justice assigned former head of the FBI Robert Mueller as special counsel to continue the investigation into Trump's alleged collusion with the Kremlin. Trump has denied that ever happened.