Hunter Biden blamed the sleeping pill Ambien for then-President Joe Biden's disastrous debate performance against Donald Trump last year.

The younger Biden made the remarks in an expletive-laden interview on YouTube's "Channel 5 with Andrew Callaghan" that was released Monday, the first anniversary of his father's decision to drop out of the presidential race.

"I know exactly what happened in that debate. He flew around the world, basically mileage that he could have flown around the world three times, he’s 81 years old, he’s tired as s---, they give him Ambien to be able to sleep, he’s gets up on the stage and he looks like he’s a deer in the headlights," Hunter Biden said in the interview.

"And it feeds into every f---ing story that anybody wants to tell."

The former president's office declined to comment.