Kasowitz did not respond to a query.
Both Comey and Mueller know each other for 15 years and the former FBI director gave the memos to the latter because he knew Mueller would launch a probe into whether Trump obstructed justice by urging Comey to end investigation into former National Security Advisor Michael Flynn's connections to Russian Federation.
Mr Robert Mueller, the special counsel named by the department to investigate the Russian Federation matter, is now examining whether Mr Trump or others sought to obstruct the probe, a person familiar with the inquiry said on Thursday.
Feinstein noted that Trump does not actually have the authority to fire Mueller, and that any effort to appoint a replacement for Rosenstein with an eye toward shutting down the investigation would result in a "rude awakening" for the President. According to James Comey, President Trump tried to ask for loyalty from the ex-FBI director and urged to see that he can "let go" of the Russian Federation investigation on Trump's administration.
On Friday, former House Speaker Newt Gingrich said that Trump technically "cannot obstruct justice" because he is the president.
Trump partially denies Comey's testimony, mum on existence of recordings
Comey also revealed that he'd orchestrated the public release of information about his private conversations with the president. Feinstein tells CNN'S "State of the Union" she won't draw any conclusions about obstruction until the matter is investigated.
A White House official said Friday's tweetstorm is a sign Trump is "taking matters into his own hands" - the latest example of how he thinks he is the best person to deliver his message.
His tweets come as Mr Trump marks two years since announcing his plan to run for president. Many new jobs, high business enthusiasm, .
And he stood by his use of social media: "The Fake News Media hates when I use what has turned out to be my very powerful Social Media - over 100 million people!"
"I don't believe it's going to happen", said Rubio on CNN's "State of the Union".
Trump advisers describe the president as increasingly angry over the investigation, yelling at television sets carrying coverage and insisting he is the target of a conspiracy.
"Crooked H destroyed phones w/ hammer, "bleached" emails, & had husband meet w/AG days before she was cleared - & they talk about obstruction?" he added. "The tweet from the president was a response to the five anonymous sources that were purportedly leaking information to The Washington Post about a potential investigation of the president".
Trump did not do anything to interfere with the investigation of Russia's interference in the election.