WASHINGTON — President-elect Donald Trump is the business titan who has spoken appreciatively of Russian President Vladimir Putin. Republican Sen. John McCain is the tough-talking national security hawk who warns that Russian interference in the U.S. election threatens to “destroy democracy.”

McCain, chairman of the Armed Services Committee, on Sunday joined Democrats in calling for a special committee to investigate foreign cyberattacks, putting him at odds not only with the incoming GOP president but with Senate Majority Leader Mitch McConnell, R-Ky., who favors allowing the Intelligence committee to take the lead on the inquiry.

“We need a select committee. We need to get to the bottom of this. We need to find out exactly what was done and what the implications of the attacks were, especially if they had an effect on our election,” McCain said. “There’s no doubt they were interfering and no doubt that it was cyberattacks. The question now is how much and what damage and what should the United States of America do? And so far, we have been totally paralyzed.”

Trump calls reports of Russian hacking “ridiculous” and his transition team dismissed the CIA assessment, saying it was the work of the same people who claimed Iraq had weapons of mass destruction.

CIA Director John Brennan has said the intelligence community is in agreement that Russia tried to interfere in the U.S. presidential election, though there’s no evidence Moscow succeeded in helping Trump win. But the charge, along with Trump’s selection of a potential secretary of state with business ties to Russia, has divided the GOP.

The fractures within the party will test long-standing GOP orthodoxy that saw Russia as a threat and responded to Putin’s annexation of Crimea with tough sanctions.