"They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story", Trump tweeted. Trump wrote on Twitter, in a pair of messages that ended with a reference to his campaign slogan "Make America Great Again".
Mr Trump fired Mr Comey last month, citing the intelligence chief's decision to announce previous year that Hillary Clinton was no longer under investigation.
That changed after Trump fired Comey. "I can tell you that for absolute certainty". He is a good guy. He said Comey had lied under oath, saying: "Frankly, James Comey confirmed a lot of what I said, and some of the things that he said just weren't true".
"It could potentially have some collusion components to it", Burr said Thursday of interviewing Coats and Rogers, who appeared before the panel Monday night in a classified setting.
Mr Comey would not say in his testimony last week whether he thought the president sought to obstruct justice, but added it would be up to special counsel Mueller "to sort that out".
"The FBI's leak of information regarding the president is outrageous, inexcusable and illegal, " said Mark Corallo, spokesman for Trump's outside legal team.
It is not all that surprising to learn that Trump is now under investigation for obstruction, given what we learned from Comey last week about his interactions with the president as well as Trump's own public admission that "this Russian Federation thing" was on his mind when he made the decision to fire Comey.
Mueller is taking up an obstruction of justice probe of Trump that began at the Federal Bureau of Investigation soon after Comey was sacked on May 9, anonymous sources told the Post.
Notably, Comey, in his carefully-worded statement, had also said that Trump's personal conduct - whether with regards to possible collusion with Russian Federation or possible obstruction of justice - was not under investigation while he was at the helm of the FBI.
Comey, who had been overseeing the bureau's Russian Federation investigation, says he had previously assured Trump he was not personally under investigation. Coats has said he didn't feel pressured to do so, however.
Rogers said he wasn't "pressured" either.
Mueller has scheduled interviews with key national security officials about the matter.
Christopher Ruddy, a longtime friend of Trump's, had said publicly that Trump was considering terminating Mueller.
Even though the White House can invoke executive privilege, the Supreme Court ruled during Watergate that government officials can't use privilege if they're withholding evidence in a criminal prosecution.