Comey also said the president demanded loyalty from him during a private conversation he had with the president.
Democratic Senator Chris Murphy, from CT, had said in a statement Thursday following Comey's testimony, "If the White House's account differs from what we heard today, the American people deserve to hear the president's side of the story in a similar forum-under oath and open to the press".
The former Federal Bureau of Investigation director said Trump's private comments urging him to drop the probe into former national security adviser Michael Flynn led him to tell his Justice Department colleagues they needed to be careful. He also said that he had never asked Mr Comey - who he fired last month - for his "loyalty" over the investigation, a key part of Mr Comey's testimony.
He also accused Qatar, a key USA military partner, of funding terrorism "at a very high level", and said solving the problem in the tiny Persian Gulf nation could be "the beginning of the end of terrorism".
"James Comey and Angus King say Trump reminds them of King Henry II, who famously remarked: "'Who will rid me of this meddlesome priest?". You're strong ... why didn't you stop and say, "Mr. President, this is wrong".
"The Russian collusion fairytale that you know I like to talk about died yesterday", Ryun said during a panel discussion on MSNBC.
Meanwhile, Trump is also being accused of flip-flopping on his reason for Comey's firing. While Trump's staunchest supporters have tried to paint Comey's testimony as vindication for the president, few Republicans who don't work for Trump stepped in to defend the president's version of his contacts with Comey. Sen. You suggested he didn't tell the truth in everything he said.
Senate Majority Leader Mitch McConnell on Friday boasted of the GOP's accomplishments under Trump thus far, and promised more to come, making no mention of Comey in a speech. But, I did not say that.
"I think it's an abuse of power, and as far as obstruction of justice", Ms Pelosi told United States broadcaster MSNBC, adding that special counsel Robert Mueller "should look into this". "Comey's statement establishes obstruction of justice by Trump".
Trump said he would "100 percent" speak under oath to refute Comey's dramatic Thursday testimony.
"You are going to be very disappointed when you hear the answer", he said a bit cryptically.
But in his long-awaited testimony before the Senate Intelligence Committee on Thursday, Comey told lawmakers he believed it was "inevitable" that Sessions would recuse himself from Russian Federation probe.
Comey gave ammunition to the president's side, too, particularly by admitting that he had orchestrated the leak of his account of his most critical meeting with Trump with the express objective of spurring the appointment of a special counsel, which he accomplished.
Trump had raised the possibility that his conversations with Comey were recorded in a May 12 tweet he sent several days after he fired him.
Pundits and legal experts were divided on whether Trump's actions rose to the level of obstruction of justice, a potentially impeachable offense, while Comey said that decision was now in the hands of the special prosecutor.
"Maybe sometime in the future people will learn whether or not there were recordings of his conversation with Comey", Trump added.
Trump says Comey cleared him. He didn't
He adamantly denied Comey's claims that he asked him to end the FBI's investigation into national security adviser Michael Flynn . He also said that any other explanations that have come from the White House were "lies, plain and simple", as Jessica reports .
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UK's odd election about nothing
He said: "For investors, a Conservative government would allow for a recovery or stabilisation in sterling exchange rates". May called the election in April, saying she wanted to go into the Brexit negotiations with a position of strength.