Fox's Brian Kilmeade ridiculed for accidentally destroying Biden conspiracy theory live on television

One of the Republican conspiracy theories is that President Joe Biden had a top prosecutor in Ukraine fired because he was investigating Biden's son.

It is a tale that has been disproved by fact-check after fact-check, but it's something Fox's Brian Kilmeade tried to reinvigorate when he interviewed former Ukraine President Petro Poroshenko. It failed spectacularly.

Kilmeade played a clip of the former prosecutor, Victor Shokin, who has promoted the conspiracy theory on numerous occasions for Fox. But on Sunday, Poroshenko wasn't playing ball.

He's "a complete crazy person," said Poroshenko of Shokin. "There's something wrong with him."

Kilmeade's face fell into a kind of blank sadness.

The moment led to internet ridicule for most of Monday afternoon.

"Did Former Ukrainian President Petro Poroshenko just completely destroy the GOP’s Biden accusations?" asked Ed Krassenstein.

"Brian Kilmeade on Sunday inadvertently took a sledgehammer to a load-bearing pillar holding up a long-debunked conspiracy that Republicans are currently trying to use to impeach President Joe Biden," described the Daily Beast.

"Please do not use a person such as Shokin to undermine bipartisan support for Ukraine," quoted John Powers of former Ukrainian President Poroshenko to Brian Kilmeade.

Robin Unger called Kilmeade "a MAGA Trump stooge."

Rep. James Comer (R-KY) then went on Fox's Sunday evening with former Sen. Trey Gowdy (R-SC) and tried to bring the conspiracy back, despite the earlier Kilmeade interview.