(CNN) House Speaker Paul Ryan and Senate Intelligence Chairman Richard Burr, both Republicans, broke with President Donald Trump on Wednesday over allegations spies infiltrated his 2016 campaign, saying they agree with GOP Rep. Trey Gowdy that the FBI did "exactly" what it should have done over its handling of a confidential source.

The declarations by the leading Republicans are the latest indications that Trump lacks any evidence to back up his claims of a major political scandal he calls "spygate" -- since those lawmakers were among a select group briefed on the classified intelligence at issue. The only Republican briefed on the intelligence who has yet to break from Trump is Rep. Devin Nunes, the House Intelligence chairman who has demanded more documents as part of his investigation.

"I think Chairman Gowdy's initial assessment's accurate, I think, but we have some more digging to do. We're waiting for some more document requests," Ryan told reporters at a news conference on Capitol Hill. "It would have been helpful if we got this information earlier."

"I think that Trey Gowdy's description of the process was correct," Burr said

Officials briefed Ryan, Gowdy and other congressional leaders last month on the FBI's use of a confidential source that interacted with Trump's campaign two years ago as the Department of Justice investigated Russian meddling.

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