'Late Show' host Stephen Colbert is calling out the mainstream media for failing to corroborate or disprove the existence of an alleged 'pee tape' starring President Donald Trump. And instead of just harping on journalists for not doing their work, he took it upon himself to travel to Moscow in search of the fabled tape.

If you haven't heard of Pee-gate, congrats on waking up from a coma. Here's a quick recap to celebrate your recovery: 10 days before President Donald Trump took office, BuzzFeed published a dossier filled with compromising claims regarding the president-elect. The most unsavory of all was the allegation that Trump hired Russian prostitutes to perform an obscene sex act in a Russian hotel. Here's how the dossier describes the alleged incident.

"TRUMP’s (perverted) conduct in Moscow included hiring the presidential suite of the Ritz Carlton Hotel, where he knew President and Mrs OBAMA (whom he hated) had stayed on one of their official trips to Russia, and defiling the bed where they had slept by employing a number of prostitutes to perform a ‘golden showers’ (urination) show in front of him. The hotel was known to be under FSB control with microphones and concealed cameras in all the main rooms to record anything they wanted to."

That allegation surfaced over six months ago, but no mainstream media outlets have verified or disproven the existence of the tape. "Your CNN's, your MSNBC's, your Fox's - they've all said, 'Oh, that's too salacious for us to even look into.' But it's the only part we care about!" Colbert said, and to prove his point, he coaxed the studio audience into chanting "Pee-pee tape! Pee-pee tape!" on last night's show.

Instead of just complaining about the gap in pee-tape coverage, Colbert jumped on a plane and headed to Moscow in search of it. He began by asking people for it on the street, but no one - not even the Russian street-meat vendor - had seen hide nor pubic hair of it. So Colbert had no choice but to dig deep and rent out the suite itself.

"When you're in this room, I don't know how to describe it; it's soaked in history. It just washes over you. It's not even like it's in the past; yer in history. Yer-in it," Colbert said from the presidential suite - which is so close to the Kremlin, Putin might've only needed binoculars to catch the alleged urinary act.

Check out Colbert's full investigation in this clip, which includes sweeping the suite for recording equipment with surveillance expert Andrei Soldatov.