Sen. Tim Kaine, D-Va., subtly mocked Donald Trump this week by suggesting the GOP nominee is often and easily confused.

Kaine, who is running now as Democratic presidential candidate Hillary Clinton's No. 2, made his comments in reference to Trump claiming this week he saw video of a plane loaded with $400 million landing in Iran just as four American hostages were released this year.

"I have no idea what he's talking about," the Virginia senator said in an interview with CBS News' Norah O'Donnell, which aired Friday. "It doesn't exist. He might be thinking about Iran-Contra from, like, 35 years ago or something like this."

"I absolutely think he's confused," he said, referring to the GOP nominee's claim as "bogus."

Kaine also took a few shots at Trump for apparently confusing the senator with former New Jersey Gov. Tom Kean.

"He recently criticized me saying I was a bad governor of New Jersey," Kaine said with a smile.

"Tom Kean was the governor of Jersey 26 years ago. I mean I — it hurt my feelings until I realized, 'Wait a minute. I was never governor of New Jersey. I didn't even live in New Jersey.' He was confusing it with a situation from two or three decades ago. Maybe that's what he's doing with this — you know, this bogus video claim," Clinton's running mate laughed.

Kaine added in response to questions about Trump's mental health, "I don't know Donald Trump, so I'm not going to make any comment about mental capacity. I don't know him. But again, when you say things, they reveal who you are. And when somebody shows you who they are, you ought to trust that."

The GOP nominee himself appeared to walk back his claim about seeing video of a plane landing in Iran, and said on social media early Friday morning that he was likely thinking of another plane.

"The plane I saw on television was the hostage plane in Geneva, Switzerland, not the plane carrying $400 million in cash going to Iran!" Trump tweeted.