It isn't. This is something he invented out of whole cloth. They hope to get Trump to pardon him and they've already said that they want to impeach Trump, again, over this.

So they're probably playing to the cameras right now. This has NO legal basis and anyone who says otherwise is scamming you. That said, there's no shortage of idiots who will make up some nonsense about what they think the law should be here and try to sell it. It's kind of what lawyers do.

It's completely unhinged and a manifestation of severe TDS.