The world watched in stunned awe Monday as U.S. President Donald Trump took Vladimir Putin at his word when the Russian despot insisted he had nothing to do with any election meddling — contrary to the findings of American intelligence agencies who have amassed reams of evidence proving Russian interference in the 2016 election.

A gold star to anyone who guessed Trump’s bizarre behaviour during his joint press conference with Putin in Finland would be top of mind for Stephen Colbert when he kicked off Monday’s monologue for Global‘s “The Late Show”.

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The Trump-Putin summit, said Colbert, “was so weird, so disturbing it’s really upset people across the partisan divide in ways I have not seen in years.”

For proof, he shared a tweet by former CIA Director John Brennan (a Republican), who declared Trump’s behaviour to be “nothing short of treasonous,” adding, “Not only were Trump’s comments imbecilic, he is wholly in the pocket of Putin. Republican Patriots: Where are you???”

Colbert managed to find some of them, thanks to a closeup of the pocket of Putin’s jacket, which contained Devin Nunes, Mitch McConnell, Paul Ryan and Vice-President Mike Pence.

Colbert also read part of a statement from Republican Sen. John McCain, who wrote, “Today’s press conference in Helsinki was one of the most disgraceful performances by an American president in memory. The damage inflicted by President Trump’s naivete, egotism, false equivalence, and sympathy for autocrats is difficult to calculate.”

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Difficult, but not impossible — especially if you have a calculator, as Cobert happened to have handy. After punching in McCain’s words, Colbert had arrived at a calculation: “Yeah, it’s treason.”

“The Late Show with Stephen Colbert” airs weeknights at 11:35 p.m. ET/PT on Global.

Colbert wasn’t the only one discussing the press conference on Monday, with other late-night hosts also having their say.

Jimmy Kimmel called it “the strangest of all 542 bizarre days of Donald Trump’s reign of error,” with him accusing the president of “rubbing his nipples up against our enemies.”

See more in the clip below:

Jimmy Fallon, on the other hand, showed a spoof video of Trump singing “I Think We’re Alone Now”. He also said his 2-hour meeting lasted “approximately 1 hour 58 minutes longer” than his meeting with Stormy Daniels.