Rep. Adam SchiffAdam Bennett SchiffSunday shows - Guns dominate after Democratic debate Schiff: Diplomacy with Iran 'only way out of this situation' Sunday shows preview: Democratic candidates make the rounds after debate MORE (Calif.), the top Democrat on the House Intelligence Committee, offered high praise for Sen. John McCainJohn Sidney McCain The 13 Republicans needed to pass gun-control legislation Biden's debate performance renews questions of health At debate, Warren and Buttigieg tap idealism of Obama, FDR MORE on Friday, saying the Arizona Republican's vocal criticism of President Trump marks his "finest hour."

"I think frankly this is John McCain's finest hour," Schiff said on HBO's "Real Time with Bill Maher."

"Probably his most important public service since Vietnam is what he is doing now. I wish we had more Republicans in the House, or maybe even one in the House, who is willing to follow his example."

McCain has been adamant in his calls for an independent commission to investigate Russia's efforts to meddle in the 2016 presidential election, as well as the Trump campaign's alleged ties to Moscow.

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The senior Arizona senator has also been critical of Trump's "America first" approach to foreign policy, saying earlier this month that "it's more confusion than anything else."

More recently, McCain has taken aim at the president over his decision to fire FBI Director James Comey, a decision he called disappointing. He told foreign officials on Tuesday at a meeting of the Munich Security Conference that if Trump hoped to interrupt the FBI's ongoing Russia investigation it would not work.

"I regret it, I think it’s unfortunate," McCain said. "The president does have that constitutional authority. But I can’t help but think that this is not a good thing for America."

The House Intelligence Committee is conducting its own probe into Trump and his aides' potential ties to Russia, and Schiff has been a vocal proponent of accelerating the investigation.