The top Democrat on the House Intelligence committee says Congress would not sit still if President Donald Trump made a decision to fire the special counsel leading the investigation into Russian interference in the US election and possible collusion with Trump's campaign.
Newsmax CEO Chris Ruddy tells Judy Woodruff of "PBS NewsHour": "I think he's considering perhaps terminating the special counsel".
"I think Congress should now intervene and they should abolish the independent counsel", the former House speaker said.
Mr Ruddy was at the White House on Monday to meet government aides, but did not speak to the president, Mr Trump's press secretary Sean Spicer said.
Two senators say they are disappointed that Attorney General Jeff Sessions has sent his deputy to testify before a committee hearing on the Justice Department's budget.
Mueller is investigating alleged Russian interference in the 2016 US presidential election and possible collusion with the Trump campaign.
A spokesman for Donald Trump's personal attorney condemned the revelation about the expanding investigation but did not directly refute the report. "He comes from a law firm that represents members of the Trump family", Ruddy said.
Democratic Congressman Adam Schiff has publicly warned Mr Trump that Congress would find a way to reappoint Mr Mueller if he was sacked.
He added: "I personally think it would be a very significant mistake".
The president previously said that fired FBI Director James Comey assured him in private conversation that he was not under investigation.
A source close to the President told CNN's Jim Acosta that Trump is being counseled to steer clear of such a dramatic move like firing the special counsel. "Ruddy does not speak for the president and the president never said that". A spokesman for the DNI also declined to comment to CNN.
Mueller is already in possession of the memos written by the former Federal Bureau of Investigation director, who documented each of his interactions with the President.
Accusations of obstruction arose last month when Trump fired FBI Director James Comey. "I know for a fact that he was under consideration and that the president did talk with him in the days before he was named special counsel".
Mueller has served multiple presidents in both parties. "If there were not good cause, it would not matter to me what anybody said", he said.
And a person familiar with Trump's thinking said Tuesday morning that it's "unlikely" the President will fire Mueller, but conceded that it's often hard to predict Trump's behavior.