Sen. Chris MurphyChristopher (Chris) Scott MurphyOvernight Defense: US, Russia tensions grow over nuclear arms | Highlights from Esper's Asia trip | Trump strikes neutral tone on Hong Kong protests | General orders ethics review of special forces White House eyes September action plan for gun proposals Trump phoned Democratic senator to talk gun control MORE (D-Conn.) is calling for President Trump to testify before congressional investigators about his interactions with fired FBI Director James Comey, after the former top cop testified before a Senate panel about his conversations with the president.

"What’s most important is that investigators in the Senate and at the Department of Justice get all the facts and find the truth," Murphy said in a statement.

"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," he added.

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In a highly anticipated testimony Thursday, Comey told members of the Senate Intelligence Committee that Trump had asked him in private conversations for a pledge of loyalty and once urged him to shut down his agency's investigation into former national security adviser Michael Flynn.

Trump abruptly fired Comey last month, initially arguing that his handling of the FBI's investigation into Hillary ClintonHillary Diane Rodham ClintonLewandowski on potential NH Senate run: If I run, 'I'm going to win' Fighter pilot vs. astronaut match-up in Arizona could determine control of Senate Progressive Democrats' turnout plans simply don't add up MORE's private email use damaged the bureau's credibility and destroyed confidence in Comey's ability to do his job.

But in an interview with NBC's Lester Holt, Trump acknowledged that he had thought of the FBI's Russia investigation in his decision to fire Comey. Subsequent news reported also revealed that the president had told visiting Russian officials a day after he ousted Comey that doing so relieved him of "great pressure" because of the probe.

Trump has also publicly denied ever asking Comey to pledge his loyalty, issuing a flat rejection of that account at a news conference last month. Comey said on Thursday that that assertion was not true.

Still, whether Trump should testify before a congressional panel is a question that has rarely been raised, and it is not common for a sitting president to do so.