Ryan said Gowdy's "initial assessment is accurate" and he's seen no evidence to the contrary.
Trump made the pardon assertion in a series of Twitter posts on Monday in which he criticized federal Special Counsel Robert Mueller's criminal probe of whether his 2016 presidential campaign colluded with Russian Federation to sway the election.
In what the New York Times described as the GOP beginning to show "signs of resistance", on Wednesday, Paul Ryan joined the handful of Republican lawmakers standing up to President Trump's war on the rule of law - sort of.
The Senate Intelligence Committee agreed to provide records in response to a request from the Justice Department, and the Senate on Wednesday passed a resolution allowing it to do so.
On Tuesday, the Senate's Republican leader, Mitch McConnell, also discouraged talk of a self-pardon by Trump.
The move comes as Republican congressional leaders are publicly disputing Trump's claims that the government planted a spy in his 2016 campaign "to help Crooked Hillary win" - a reference to his Democratic opponent Hillary Clinton. During a press briefing last week, Press Secretary Sarah Sanders responded to Gowdy's comments by saying "clearly, there's still cause for concern that needs to be looked at". But they eventually relented after pressure from Trump, Nunes and Ryan.
'It was President Trump himself who said, No. 1, 'I didn't collude with Russian Federation, but if anyone connected with my campaign did, I want the Federal Bureau of Investigation to find that out, " Gowdy said. After Ryan's remarks, Senate Intelligence Committee Chairman Richard Burr - who was briefed with Ryan and other top lawmakers on the informant last month - said Gowdy's analysis was correct.
After reviewing highly classified information last week, Republican Representative Trey Gowdy, chairman of the House Government Oversight Committee, dismissed the assertion that U.S. agents targeted Trump.
"It would have been helpful if we'd gotten this information earlier", Ryan added.
His comments prompted a wave of push back from Trump allies, including the president's personal attorney, Rudy Giuliani, who called him "uninformed".
"Paul Ryan stating that no man is above the law and that Donald Trump shouldn't pardon himself is something that we should seize upon", Scarborough added, "because right now the president of the United States believes that he is above the law". "But I think obviously the answer is, he shouldn't and no one is above the law". "You know what I'm saying?"
"Obviously the answer is he shouldn't", Ryan said, regarding the president potentially pardoning himself.