As for Comey, whom Trump fired last week, the FBI director wrote in a memo after a February meeting at the White House that the new president had asked him to shut down the FBI's investigation of Flynn and his Russian contacts, said a person who had read the memo.
Wittes is a self-described close personal friend of Comey.
The New York Times reported on Tuesday that a memo from Comey revealed Trump requesting that he drop his investigation into Flynn.
The White House denied the report. "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, including any investigation involving General Flynn", a White House statement said.
A report by the Boston Globe discusses the potential scandal that is developing against President Trump in regards to the FBI investigation into Michael Flynn's relationship with high-level officials in Russian Federation.
An emailed fundraising appeal by Trump's political organization and the Republican National Committee sent out after reports of the Comey memo said Trump was being victimized by an "unelected bureaucracy". The Flynn investigation was part of a broader investigation into Russian interference in last year's presidential election.
He riled administrations of both parties with his moral certitude and decisions that critics said strayed from ordinary protocol, such as his public announcement - without the involvement of the Justice Department - that the Federal Bureau of Investigation would not recommend criminal charges against Hillary Clinton for her email use.
"I hope you can see your way clear to letting this go, to letting Flynn go", the memo quotes Trump as saying, according to the newspaper.
Asked what he thinks of the Trump presidency, Putin said it's up to the American people to judge and his performance can be rated "only when he's allowed to work at full capacity", implying that someone is hampering Trump's efforts.
The newspaper said Comey was in the Oval Office that day with other national security officials for a terrorism threat briefing.
On Tuesday, for the second night in a row, Senate Republicans and Democrats were caught off-guard as they entered the chamber for a scheduled vote.
Republican U.S. Representative Jason Chaffetz, chairman of a House of Representatives oversight committee, said his committee "is going to get the Comey memo, if it exists".
A Kremlin aide, Yuri Ushakov, later told reporters that Moscow had a written record of the conversation, not an audio recording.
Tom CarperTom CarperDems seek damage assessment after Trump's meeting with Russians Overnight Energy: Senate panel advances regulatory reform bills Heitkamp breaks with Dems on regulations MORE (Del.), Gary Peters (Mich.) and Martin HeinrichMartin HeinrichDems seek damage assessment after Trump's meeting with Russians Dem senators push for probe of Sessions over Comey firing Dem senator lists Trump's past "recklessness" on classified info MORE (N.M.) said that disclosure of certain sensitive information could compromise intelligence sources.
Said Sen. Lindsey Graham of South Carolina: "He's probably glad to leave town, and a lot of us are glad he's leaving for a few days".
"You already knew the media was out to get us", it said. "Memos, transcripts, tapes - the list keeps getting longer", he said.
Putin, who still hopes Moscow can fix battered ties with the United States despite a deepening political scandal in the United States related to Trump's purported Russian Federation ties, said Moscow had rated Lavrov's meeting with Trump highly.