"I think in many ways our institutions are under assault", Mr Clapper told CNN's Face the Nation on Sunday.
Fisher formerly served as assistant attorney general for the Justice Department's Criminal Division.
Durbin said Trump's tweet on Friday "could be construed as threatening a witness in this investigation, which is another violation of federal law".
Former National Intelligence Director James Clapper testifies on Capitol Hill in Washington, Monday, May 8, 2017, before the Senate Judiciary subcommittee on Crime and Terrorism hearing: "Russian Interference in the 2016 United States Election". Trump says in the Oval Office that the administration is working to quickly find a successor to Comey.
Comey was "taken aback" by Trump's request for a personal assurance or pledge of loyalty at the dinner, a source close to Comey told CNN. Comey instead told Trump he could count on his honesty, the Times said.
Trump began by acknowledging the FBI investigation into Clinton helped him as a presidential candidate. The White House claimed that Trump sought guidance from the Department of Justice on what to do with Comey, but Trump himself then said in an interview that he would have fired Comey "regardless" for being him a "showboat". Trump said Comey wanted to have the dinner because he wanted to stay on in the job.
Trump allegedly asked Comey to shut down Flynn investigation
House Speaker Paul Ryan has endured a rocky relationship with Trump but has stood by the President during his trials so far in the administration.
The idea, meanwhile, that Comey would have taped the conversation is virtually impossible, Dean and Montoya agreed.
"As a very active President with lots of things happening, it is not possible for my surrogates to stand at podium with ideal accuracy!"
"But as a matter of practice, I doubt either did it and that it's just another bluff from Trump", he continued. The initial reason given in Comey's termination letter was that Trump was acting on the recommendation of Attorney General Jeff Sessions and Deputy Attorney General Rod Rosenstein. He confirmed the validity a statement he made in March, when said that he hadn't seen any evidence of Russia-Trump campaign collusion in the 2016 election. Comey is only the second director to be fired in the 82-year history of the Federal Bureau of Investigation, and some journalists found it remarkable that there seemed to be such confusion at the White House among key aides. On Thursday, Trump told NBC he knew he ran the risk that by firing Comey he would "confuse people" and "lengthen out the investigation" into ties to Russian Federation.
Trump told Fox News he was surprised by the fierce reaction of Democrats.
"I do know that it came as a great shock, it was very disturbing to Federal Bureau of Investigation employees", Clapper said. Moscow has denied any such meddling.
News of firing took many White House officials by surprise, forcing them to scramble to provide explanations that proceeded to change in the hours and days after the news broke.
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