President-elect Donald Trump may want the U.S. to improve diplomatic ties to Russia—but he doesn’t speak for the neocon GOP establishment. That’s why Republican hawks are hoping to legitimize the Clinton campaign claim that Russian infiltrators aided Trump in electoral victory.

Sen. John McCain (R-Ariz.) says “there’s very little doubt” Russia interfered with the U.S. presidential election and his Armed Services Committee is out to find out how.

The Washington Post reported last week:

Senate Armed Services Committee Chairman John McCain (Ariz.) is readying a probe of possible Russian cyber-incursions into U.S. weapons systems, and he said he has been discussing the issue with Senate Select Intelligence Committee Chairman Richard Burr (N.C.), with whom he will be “working closely” to investigate Russia’s suspected interference in the U.S. elections and cyber threats to the military and other institutions. Senate Majority Leader Mitch McConnell (R-Ky.) has been apprised of the discussions. Burr did not respond to requests for comment. Senate Foreign Relations Committee Chairman Bob Corker (R-Tenn.) also said he intends to hold hearings next year into alleged Russian hacking. Corker is on Trump’s shortlist for secretary of state, according to the Trump transition team.

This is the beginning of a post-election push by the Republican establishment to ensure that a Trump administration isn’t a threat to the nation’s saber-rattling tendencies.

McCain has previously called Russian leader Vladimir Putin a “thug” and a “murderer” and has repeatedly chided Trump for taking a softer stance against Russian interference in Syria than his election opponent.

He’s also been the cheerleader for every U.S. military misadventure in recent U.S. history. This is no different. Remember when he was photographed hanging out with those “moderate” rebels in Syria?

“Democrats and Republicans must work together, and across the jurisdictional lines of Congress, to examine these recent incidents thoroughly and devise comprehensive solutions to deter and defend against cyberattacks,” he said announcing the new probe.

In other words, Congress is about to make it impossible for Trump to pursue diplomatic solutions with Russia.