Mr Comey testified that he had given a memo, including details about a conversation with President Trump, to a friend - who was later identified as law professor Daniel Richman.
Key points such as whether Mr Trump implied Mr Comey would keep his job if the "cloud" of the Russian Federation probe lifted, or whether the president asked Mr Comey to drop the investigation into fired NSA Advisor Michael Flynn, remain one man's word against the other.
Mr Kasowitz also maintained that the testimony made clear that Mr Trump "never, in form or substance, directed or suggested that Mr Comey stop investigating anyone".
During Thursday's hearing, Comey explained his concern about his meetings with the president, saying he did not feel comfortable being in a room alone with Trump, as he felt the president was attempting to seek personal loyalty from the Federal Bureau of Investigation director, despite the department's duty to remain neutral. "Who would ask a man to pledge allegiance under oath?" he said. Dershowitz went on to say that even if we don't like the President having that authority, he has that power and you can't turn a Constitutional power into a criminal act.
"Lordy, I hope there are tapes", Comey said at the hearing. Such an offence potentially could lead to Trump being impeached by Congress, although his fellow Republicans who control the Senate and House of Representatives have shown little appetite for such a move.
Earlier in his press conference, Trump said he was "happy" with parts of Comey's testimony, including that the former FBI director said he had assured the president he wasn't personally under investigation regarding the Russian meddling in the election and possible collusion by Trump campaign aides. I'm not going to say I want you to pledge allegiance.
"I hardly know [Comey]". "Mr. Comey has now admitted that he is one of these leakers".
"I didn't say that", Trump said Friday. The visit was the first for Iohannis at the Trump White House.
But Trump refrained from confirming that he had records of conversations with Comey as he previously implied.