Speculation that President Donald Trump plans to remove the special investigator looking into Russia's meddling with the presidential election has been rampant.
Several White House officials and Trump associates insisted on anonymity in order to discuss the president's views of the unfolding investigation.
Moscow also refuted the allegations of interfering in the 2016 presidential election and called them absurd. The Washington Post reported this week that Mueller is investigating whether Trump attempted to obstruct justice when he suggested Comey drop an FBI investigation into Michael Flynn, Trump's former national security adviser, as well as when he fired Comey.
"Concerns are already being raised - including about Mueller's friendship with [former FBI Director James] Comey and his staff-packing with anti-Trump partisans". Though some in the White House have preached caution, fearing a repeat of the firestorm over Comey's firing, many in Trump's orbit - including his son Donald Trump Jr. and adviser Newt Gingrich - have deemed Mueller biased and worthy of dismissal.
In his latest of four Friday morning tweets, all angry and combative, the President says he is being investigated, and appears to target Deputy Attorney General Rod Rosenstein. The questions included whether he had confidence in Rosenstein, whether he plans to fire special counsel Robert Mueller and how he knows he's under investigation by the FBI.
"As a matter of honor, and in light of his sworn testimony before Congress, Rosenstein would inevitably resign if confronted with a White House directive to dismiss the special counsel".
"They made up a phoney collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phoney story".
With news reports that the Special Counsel investigating election interference in 2016 by Russian Federation is looking at possible obstruction of justice by President Donald Trump, Mr. Trump expressed frustration Thursday at the prospect of that review, again taking to Twitter to denounce the probe as a "witch hunt", and complaining that Hillary Clinton should be the subject of a Russia-related investigation, not him.
Dianne Feinstein, top Democrat on the Senate Judiciary Committee, said she was "increasingly concerned" that Trump will fire both Mueller and Rosenstein.
Vice President Mike Pence has also hired a private lawyer to represent his interests in the expanding probe. "Nice", Trump wrote in his first tweet.
"Why is that Hillary Clintons family and Dems dealings with Russian Federation are not looked at, but my non-dealings are?" he asked at one point.
"You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!"