Former FBI Director James Comey has agreed to testify in open session at the Senate Intel Committee Sen. "I hope that former Director Comey's testimony will help answer some of the questions that have arisen since Director Comey was so suddenly dismissed by the President", Warner said.
Committee leaders said on Friday he would appear sometime after the US Memorial Day holiday on May 29.
Mr Trump told Russian officials during an Oval Office meeting that firing Mr Comey eased pressure caused by an investigation into the Kremlin's influence in the 2016 campaign, The New York Times reported.
"I faced great pressure because of Russian Federation. He was insane, a real nut job", Trump said, according to the report.
"The President has always emphasized the importance of making deals with Russian Federation as it relates to Syria, Ukraine, defeating ISIS and other key issues for the benefit and safety of the American people".
And The New York Times reported the president had told Russian diplomats last week his firing of "nut job" Mr Comey had relieved "great pressure" on him.
Russian conversations intercepted by United States intelligence during the 2016 presidential campaign indicated that Moscow saw Donald Trump associate Michael Flynn as an ally who could help influence the Republican nominee, CNN reported Saturday. -Va., the committee Vice Chairman.
He continues, "Comey regards his predecessor as a mentor, while Mueller considers Comey his protégé".
Among Trump's senior White House advisers are several former campaign officials, including his son-in-law Jared Kushner, Steve Bannon, Stephen Miller and Kellyanne Conway.
The reports came just as Trump flew to Saudi Arabia to kick off his first foreign trip as U.S. leader - highlighting how the controversy over his team's alleged links to Moscow is dogging his fledgling presidency. The Russians later posted photos of a beaming Trump shaking hands with Lavrov and Kislyak, which the White House had reportedly been assured would not be done.
This comes as the actions of a current White House official are under investigation. But he added: "I haven't lost my confidence in the president to be our president, I just haven't".
Reports since his firing have fueled speculation that his termination had something to do with the FBI's investigation into possible collusion between the Trump campaign and Russian Federation. 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. Kushner initially omitted contacts with foreign leaders from a national security questionnaire, though his lawyer has said publicly that he submitted the form prematurely and informed the Federal Bureau of Investigation soon afterward that he would provide an update.
But Rosenstein also threatened to resign if Trump's White House kept using his memo - which never explicitly advocated for firing Comey - as the linchpin for doing Comey in.
"When I chose to just do it [fire Comey], I said to myself, 'You know, this Russian Federation thing with Trump and Russian Federation is a made up story, it's an excuse by the Democrats for having lost an election that they should've won, '" Trump said, admitting that he fired Comey because of FBI investigation of alleged ties between his aides and Russian Federation.
The Justice Department's newly appointed special counsel, Robert S. Mueller III, was given the authority to investigate not only potential collusion, but also related allegations, which would include obstruction of justice.