Republican senators warned U.S. president Donald Trump on Sunday not to fire Special Counsel Robert Mueller, and said the president must let federal investigators looking into Russian meddling in the United States election do their jobs.
"The special counsel should be free to follow through his investigation to its completion without interference".
"This attack on my credibility is one part of a larger effort not just to slander me personally, but to taint the Federal Bureau of Investigation, law enforcement, and intelligence professionals more generally", McCabe said.
The Wisconsin Republican also said he has been assured that Mueller's firing is not imminent, although he declined to elaborate on who provided that assurance.
Republicans have taken notice of Trump's blistering criticism of Mueller, who is conducting a criminal probe into whether Trump's 2016 presidential campaign had ties to Russian Federation and whether there has been obstruction of justice since then.
The president's comments came a day after his lawyer, John Dowd, said it was time for the special counsel's investigation to end.
Among the events being examined by Mueller's prosecutors are the firing past year of FBI Director James Comey and the ouster of former White House national security adviser Michael Flynn.
And he says Trump's recent tweets criticizing Mueller's team are part of his "well-established frustration for more than a year this has been going on".
The tweet marks one of the first times that Trump has mentioned special counsel Robert Mueller by name.
Two people familiar with the situation told the Post that Trump's attorneys are anxious that the President could get into trouble during a lengthy interview with the special counsel, and therefore provided "written descriptions" of moments under investigation to limit some of the questioning.
Two GOP senators on the Judiciary Committee - Graham and Jeff Flake (R-Ariz.) - said they want to review whether the firing was justified. "If he tried to do that, that would be the beginning of the end of his presidency, ' said Sen".
Dowd initially said he was speaking on behalf of the president, in his capacity as the president's attorney - though he later walked that back, saying he was speaking in his personal capacity and not on the president's behalf.
Trump had long pressured his attorney general Jeff Sessions to remove McCabe, alleging bias in the FBI was behind investigations into his campaign.
Rubio, who sits on the Senate Intelligence Committee, vouched for Mueller's investigation later in the interview when asked about Trump's tweet Saturday night that the probe "should never have been started".
"I don't know what the designs are on Mueller, but it seems to be building toward that, and I just hope it doesn't go there, because it can't".
In a stinging January interview with The Daily Caller, diGenova accused the top leadership in the Obama Justice Department of "plotting" against Trump.
"The Fake News is beside themselves that McCabe was caught, called out and fired", he wrote.
Mr Dowd said he was not calling on Mr Rosenstein to fire the special counsel immediately and had not discussed with him the idea of dismissing Mr Mueller or ending the probe.
CNN reported in January that Mueller's team had given the President's lawyers general topics for an interview, such as Trump's request that Comey drop the investigation into Flynn, his reaction to Comey's May 2017 testimony on Capitol Hill, and Trump's contact with intelligence officials about the Russian Federation investigation. The Associated Press is reporting that McCabe's memos have been provided to special counsel Mueller.
Trump, Graham said, is not without reason for being upset with the Department of Justice over its surveillance of members of his 2016 campaign.
"He would be wrong, in my view, to try to stop this investigation without cause on the Mueller side", he said.
Mr Trump also claimed Mr Comey lied under oath at a Senate hearing by saying he had never been an anonymous source. "If you have an innocent client, Mr. Dowd, act like it".
Trump can not directly fire Mueller. Yet behind the scenes, the President has wavered on his pledge as friends and advisers cautioned him of the risks of speaking to prosecutors who've already charged 19 individuals with criminal offenses, including lying.