One memo recounts a February request from Trump that Comey end an investigation into former National Security Adviser Michael Flynn.
Deputy Attorney General Rod Rosenstein appointed Mueller as special counsel shortly after Comey's firing.
Tensions are building inside the Justice Department as Deputy Attorney General Rod Rosenstein contemplates whether he will become a witness in the ongoing investigation into Russian meddling in the 2016 U.S. elections.
The two hour-long testimony saw Comey further informing that Trump had directed him to drop an Federal Bureau of Investigation probe against former national security adviser Michael Flynn.
President Donald Trump says the economy is improving and job numbers are up, despite the "phony Witch Hunt" against him.
The federal investigation led by special counsel Robert Mueller, a former FBI director, is reportedly examining whether Trump's actions rise to the level of obstruction of justice.
The special counsel overseeing the investigation into Russian election meddling and any ties between Russia and the Trump campaign is reviewing whether President Trump tried to obstruct justice, according to a report published Wednesday night in The Washington Post that cited unnamed officials.
That appeared to be the first public confirmation that Trump is being investigated for obstruction of justice - and a digital salvo trained at Deputy Attorney General Rod Rosenstein, who wrote a memo criticising Comey.
Rosenstein, 52, has said little publicly, but a cryptic statement he released late Thursday captured some of the strain and frustration he is probably feeling about the numerous unauthorized leaks about the Russian Federation investigation that have angered the president, according to several of his colleagues and friends.
Security tightened ahead of Congressional Baseball Game after shooting
Aguilar plays outfield for the Democratic team; before the shooting, Scalise was slated to play second base for the Republicans. President Donald Trump , right, shakes hands with Steve Scalise in the East Room of the White House on March 7, 2017.
"The message the president is sending through his tweets is that he believes the rule of law doesn't apply to him and that anyone who thinks otherwise will be fired", Feinstein said in a statement.
The President's tweet - seeming to confirm the probe based on news reports - came as a surprise to the President's own legal team, according to a person briefed on the matter. They are Paul Manafort, Trump's former campaign manager; Rick Gates, Manafort's business partner; Carter Page, a former foreign policy adviser; Flynn; and Roger J. Stone Jr., an informal adviser to Mr. Trump.
In another tweet earlier Friday, Trump writes, "After 7 months of investigations & committee hearings about my 'collusion with the Russians, ' nobody has been able to show any proof".
Rosenstein, the official who would be responsible for dismissing Mueller, told US lawmakers he would fire him only with good cause.
Citing a memo from the general counsel's office of Trump's transition team, the Times said members were given the order on Thursday for any information involving Russian Federation or Ukraine in the latest sign of the investigation's expanding reach.
The president tweeted Friday, "The Fake News Media hates when I use what has turned out to be my very powerful Social Media - over 100 million people!"
Pause for a moment to soak in that the President of United States confirmed on the record via Twitter that Mueller is gunning for him.
Eight hours later, after a busy day meeting with governors and witnessing the formal investiture of his pick for the Supreme Court, Trump returned to the topic again in a pair of tweets suggesting that Hillary Clinton, his Democratic opponent in the election, should be under investigation instead of him.
Comments