President Donald Trump asked former FBI director James Comey to scrap an investigation into former security adviser Michael Flynn, US media has reported.
The news comes at the end of a tumultuous period for Mr Trump.
Consternation and confusion overtook Capitol Hill on Tuesday as Republicans confronted the revelation that President Donald Trump had disclosed highly classified information to the Russians.
Gen Flynn was forced to resign after misleading top White House officials about his contacts with Russian Federation.
Oil prices dropped after data showed an increase in US crude inventories, stoking concerns that markets remain oversupplied despite efforts by top producers Saudi Arabia and Russian Federation to extend output cuts.
Republican Jason Chaffetz, chairman of the House Oversight and Government Reform Committee, sent a letter from the Federal Bureau of Investigation asking for the handover of "all memoranda, notes, summaries and recordings referring or relating to any communications between Comey and the President". He also published his letter to the FBI's acting director, Andrew McCabe, urging him to provide all of Comey's documents on meetings with the president within a week.
If the claims in his memo are correct, they would appear to offer the most compelling evidence yet that Trump's attempt to shut down the probe could amount to an obstruction of justice that imperils his presidency.
A damning performance by Comey could further add to their doubts and leave Trump in deep political peril if his alleged missteps persuade even a Republican Congress to contemplate impeachment proceedings.
Senator Susan Collins, the Maine Republican, said it would be "very troubling" if Trump did share "sensitive reporting" with the Russians.
"While the president has repeatedly expressed his view that General Flynn is a decent man who served and protected our country, the president has never asked Mr Comey or anyone else to end any investigation", a U.S. official said on condition of anonymity. But the White House initially disputed it.
Flynn was forced to resign February 13 after reports of the Yates-White House conversation.
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In firing Comey, the Trump administration chose not to wait for the results of a review by the Justice Department's inspector general into Comey's actions in the Clinton email investigation.
White House Press Secretary Sean Spicer along with White House Chief of Staff Reince Priebus are frequently discussed as staffers in danger of getting axed.
Republicans, caught off-guard, insisted they wanted to hear from Comey, who was sacked last week a day before Trump met in the Oval Office with the Russian diplomats.
Mark Warner of Virginia, top Democrat on the Senate intelligence committee, said he would ask Comey for additional material as part of that panel's investigation.
The person said the goal of the memos was to keep a record of encounters Comey found odd or troubling.
Rep. Justin AmashJustin AmashFirst Republican raises impeachment for Trump GOP rep calls for special prosecutor on Russia House GOP not sold on Ryan's tax reform plan MORE (R-Mich.) on Wednesday said reports that President Trump pressed ousted FBI Director James Comey to end an investigation would merit impeachment if true, becoming the first Republican lawmaker to broach the idea. He noted that attorney general Jeff Sessions has recused himself and deputy attorney general Rod Rosenstein wrote a memo justifying the firing of Comey.
Senate Majority Leader Mitch McConnell responded tersely "no" when pressed on whether he had concerns about the president's ability to handle classified information, or whether he was losing confidence in Trump.
"For a president - and tone is everything - that's why the memo has to be seen and that's why, if there are tapes, we should hear them", Dershowitz told Anderson Cooper on CNN. The associates revealed the information to The Post on condition of anonymity.
A person who had seen the memo told The Associated Press what Comey had written.
It was the second media bombshell to explode in two days, following the report Monday afternoon by the Washington Post that Trump shared classified information about ISIS with two visiting Russian officials, Foreign Minister Sergei Lavrov and Ambassador Sergey Kislyak.
A US official who confirmed the disclosure to The Associated Press said the revelation potentially put the source at risk.