Some 45 percent of respondents said they are more likely to believe Comey, while 22 percent said the same for Trump, who has disputed key parts of Comey's testimony.
Comey was leading the investigation into allegations Russian Federation tried to sway the election toward Trump and the possibility Trump associates colluded with Moscow when the president fired him on May 9, sparking a political firestorm. Mr Mueller's team is now reportedly investigating whether Mr Trump attempted to obstruct justice in his comments to Mr Comey about the FBI's investigation, and whether he furthered that attempted obstruction by firing the former FBI chief.
Trump complained that Mueller, who served as Federal Bureau of Investigation director under presidents George W. Bush and Barack Obama, was close friends with his predecessor, James Comey, and had hired Hillary Clinton supporters to join his investigative team as special counsel.
Director of National Intelligence Dan Coats and National Security Agency Director Admiral Mike Rogers met separately last week with investigators for special counsel Robert Mueller and the Senate Intelligence Committee, according to CNN.More news: Parker County Mother Charged in Deaths of Children Found in Hot Car
Mueller is investigating whether Trump obstructed justice by firing Comey last month after asking him to scale back the FBI's Russian Federation probe.
Thanking VA Secretary David Shulkin, Trump gave another of his occasional threats to fire cabinet officials.
Flynn's firing ratcheted up the investigation of him, as well as the investigation of whether anyone from the Trump campaign had assisted Russian intelligence agents in hacking into computers in America in order to affect the outcome of the election.
"So you'll have to do a little investigative reporting to determine that".More news: Kim Kardashian and Kanye West to hire surrogate for third child?
"I certainly think that the president would hope that the former director would tell the truth. He did admit that what I said was right".
Trump's tweets on Thursday raised questions about why the president would have staked his reputation and political capital on promoting something that wasn't real.
Nunes later told Fox News host Sean Hannity that he felt obligated to brief the President on the unmasking issue because he was "taking a lot of heat in the news media" for his wiretapping tweets.
Trump flirted with presidential runs in 1988 and 2000 before abandoning them. And more questions may soon emerge as to why, in his tweets denying he recorded Comey, did he raise the possibility anew that he might be under some sort of surveillance in the White House.
The House panel said on June 9 it had written to Don McGahn, the White House counsel, asking about the existence of any recordings or memos covering Mr Comey's conversations with Mr Trump and asked that copies of the materials be provided to the panel by June 23. "The whole thing is ridiculous, if you want to know the truth, from that standpoint". He is friends with James Comey.More news: Obama readied USA for 'cyberwarfare' against Russian Federation after hearing of election interference