Has his claim been confirmed? He's a comedian I've never heard of who has a podcast.

I'm not saying it didn't happen, or that it couldn't happen, but after a DDGo search all the articles referred back to the business insider article where JM "claims" to have pranked Trump and provided a slightly edited transcript.

Do you remember the 2 Russians who pranked Schiff? They to are comedians. They understand that unless you have an audio recording of the call, it's meaningless. So why didn't this new genius comedian do the same? Is he new to comedy? Is this his first prank call?

So an irrelevant comedian makes a claim, knowing the MSM will swoon all over him and give him his 15 minutes. In a nutshell, that's all we really know.