Here's a very rough summary of the main points. Neither of them was saying for sure that it was Mossad.

It was an interview with Harrison H Smith, who is a reporter for Infowars. He was told by an associate of Charlie Kirk that wants to remain unnamed, that Kirk was afraid of being assassinated by Mossad. Harrison Smiths's twitter is https://x.com/HarrisonHSmith.

There's also a video clip of a Megan Kelly interview with Charlie Kirk. Charlie Kirk says, "I have less ability sometimes online to criticize the Israeli government about backlash than actual Israeli citizens. And that's really, really weird, isn't it? That's not right."

All that is in the very beginning. Then they start with some other potential evidence (could an amateur do it, something about the private jet plane that took off just afterwards with it's tracking disabled, etc.

Also, this wasn't part of the podcast, but here's a video from 2 days ago, and shows Charlie Kirk talking to Ben Shapiro, asking some very pointed questions about Israel. https://www.youtube.com/watch?v=Gt4rRPkyjVY&ab_channel=CharlieKirk

He asks things like, "Some of my supporters say that Israel is committing genocide in Gaza. What do you say to that?"

Etc. People point to that as evidence that Israel was worried that Charlie Kirk was in the process of turning critical of Israel.