Attention in Washington has turned to whether Trump might seek to fire Mueller, the former FBI director named last month by the Justice Department to head the federal probe into the Russian Federation issue.
Though Trump has lambasted Comey as a "leaker", he also claimed "total and complete vindication" following the ex-FBI chief's testimony, focusing on Comey's confirmation that Trump was not personally being probed.
"No I didn't say that", Trump insisted.
During nearly three hours of statements Thursday before the Senate Intelligence Committee, Comey described himself as "stunned" by Trump's "very disturbing" and "very concerning" behaviour in several of their meetings. "We were very, very happy, and, frankly, James Comey confirmed a lot of what I said, and some of the things that he said just weren't true", he said.
When asked by a reporter if Trump asked Comey to drop the investigation into Flynn, he said: "I didn't say that". It was the first public appearance of Comey since his firing in May.
"Oh, you're going to be very disappointed when you hear the answer, don't worry", said Trump. "I mean, I will tell you I didn't say that", Trump responded.
Read: Did James Comey Lie During Testimony?
"I would like to invite the President to testify before the Senate".
During testimony before the Senate intelligence committee, Comey called Trump a liar no less than five times, questioning his integrity during a three-hour hearing.
Donald Trump is being urged to come clean over claims he has tapes of private conversations with sacked Federal Bureau of Investigation director James Comey. "So, I don't think a subpoena should be necessary, and I don't understand why the president just doesn't clear this matter up once and for all".
"I believe the James Comey leaks will be far more prevalent than anyone ever thought possible", the president tweeted Sunday morning. Comey merely testified that the FBI investigation into possible collusion between Russian Federation and the Trump campaign did not extend to Trump himself during the time Comey was leading the FBI.
When Comey was sacked, the White House alluded to the director's failure to move forward with the investigation of 2016 Democratic presidential candidate Hillary Clinton's use of a private email server.