Comey, speaking under oath, said the administration had offered "shifting explanations" about why he was sacked. Trump's only written statement remains the May 9 letter in which he asserted that Comey had told him "on three separate occasions that I am not under investigation".
Comey also said Trump told him during a one-on-one dinner on January 27 that he needed "loyalty".
Faiza Patel, co-director of public policy group Brennan Center for Justice, noted that Comey testified that he was careful to avoid putting classified information in memos memorialising his conversations with Trump.
The high profile hearing is scheduled to find out the circumstances under which Comey was sacked and if Trump had interfered with FBI investigations.
Kasowitz said the leak contained "privileged communications with the president".
"I was just going to quote that", Senator King said.
The Partisan bar just off the tourist-rich National Mall will offer "The Last Word" and "Drop the Bomb" cocktails and "The Patriot" breakfast sandwich.
Tonko called for an independent commission to investigate the matter. "And my judgment was I needed to get that out in the public square so I asked a friend of mine to share the content of the memo with a reporter".
"I mean, this is a president of the United States, with me alone, saying "I hope" this".
At the very least, it's an understanding of the lines of independence between the White House and the Federal Bureau of Investigation that the President does not have, based on Mr Comey's notes. "There was an explanation", Comey said. He said that "I was honestly concerned he might lie about the nature of our meeting and I thought it important to document".
Comey said Trump asked him to back off his agency's investigation into former National Security Adviser Michael Flynn by saying, "I hope you can let this go".
"The president never suggested that Mr. Comey 'let [Michael] Flynn go.' As the president publicly stated the next day, he did say to Mr. Comey 'General Flynn is a good guy, he had been through a lot, '" Kasowitz said.
"Lordy, I hope there are tapes", he told the committee regarding whether Trump had recorded their conversation.
US law enforcement officials said Comey had discussed his testimony with Mueller's investigative team to ensure it did not interfere with the special counsel's probe. He accused Comey of being one of those leakers. The former director immediately dove into the heart of the fraught political controversy around his firing and whether Trump interfered in the bureau's Russian Federation investigation, as he elaborated on written testimony delivered Wednesday. Comey said there was more he could say about Sessions that he could not discuss in an open hearing.
Comey admitted to orchestrating leaks from the investigation to the media using a network of friends.
Robert Mueller, who served as FBI director for the Bush and Obama administrations from 2001 to 2013, has been appointed as a special counsel to oversee the investigation into the Russian Federation probe.
Comey had quite a bit to say about his firing, which leaves him looking like a disgruntled former employee. "It is overwhelmingly clear that there have been and continue to be those in government who continue to undermine this administration with selective and illegal leaks".
Kasowitz is playing a lead role in handling Trump's responses to the Russian Federation investigation.
"You can infer from what he said today that he thinks there's at least an investigatable case of obstruction", said Robert Weisberg, director of Stanford Law School's Criminal Justice Center.
This is one area where Trump's unfamiliarity with Washington may well have caused a controversy that a president who was more of an "insider" would have handled without creating a fuss.