According to a report in the New York Times, President Donald Trump had already planned to fire Robert Mueller after he learned the special counsel is friends with fired FBI Director James Comey.
Trump - and Attorney General Jeff Sessions - have denied they interfered with the investigation.
Several legal experts said that Mr Comey's testimony, about Mr Trump telling him he expected loyalty and hoped he could drop an investigation of a former top aide, could bolster obstruction of justice allegations against the President.
In a subsequent tweet, Trump wrote, "You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!"
It took about 24 hours, but the White House has knocked down speculation that President Donald Trump considered firing special prosecutor Robert Mueller.
Sessions was forced to recuse himself in March from the federal investigation into possible Russian interference in the USA election after media reports said that he twice met with Kislyak during the 2016 campaign and did not disclose that to the Senate during his confirmation hearing in January.
Testifying at a Senate Intelligence Committee hearing, Sessions, who was a close Trump adviser during the battle for the presidency, said it is a "detestable and appalling lie" to suggest that he participated in or was aware of any collusion between Russian Federation and the Trump campaign.
Mr Trump said when he dismissed Mr Comey on May 9 that the reason was the former FBI chief's handling of the investigation into Democrat Hillary Clinton's use of a private email server.
A spokesman for Trump's lawyer told NBC: "The FBI leak of information regarding the president is outrageous, inexcusable and illegal". The five told the American newspaper that three senior United States intelligence officials are ready to appear in front of Special Consul Mueller and provide testimony in the matter.
Draymond wears T-shirt trolling Cavaliers at Warriors parade
The always outspoken Draymond Green took a shot at the Cavaliers during the Warriors championship parade on Thursday. And there Draymond Green was, celebrating his second championship trophy with his teammates.
"If Trump and his associates have done something improper, you've got to investigate that as well", Stewart said.
Recent reports have said Trump also requested help from Coats and Rogers to pressure Comey to end the investigation into Flynn's activities.
BARRETT: We got a statement this evening from a spokesman for the president's personal lawyer which basically accused the Federal Bureau of Investigation of leaking and didn't frankly say much else.
While a sitting president is unlikely to face criminal prosecution, obstruction of justice could form the basis for impeachment.
Last week the White House began referring all questions about the Russian Federation investigation to Trump's personal lawyer, Marc Kasowitz.
In the most famous presidential investigation, Watergate, Archibald Cox was appointed special prosecutor on May 18, 1973 - by June 5, Nixon was complaining about being attacked by Cox.
SHAPIRO: What has the response been from the president and his team?
An Associated Press/NORC Center for Public Affairs Research poll found about 60 percent of Americans think Trump attempted to obstruct or impede the investigation.
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