Ex-prosecutor laughs at Roger Stone's belief Mueller needs him to testify: All he adds is 'carbon dioxide'

After Donald Trump associate Roger Stone appeared on ABC on Sunday morning to say he would never bow to special counsel Robert Mueller and turn on the president, a former federal prosecutor mocked Stone for believing Mueller even needs him on the stand.

Speaking with MSNBC host Alex Witt, legal analyst Glenn Kirschner was asked about Stone's remarks where he boasted, "There’s no circumstance under which I would testify against the president because I’d have to bear false witness against him. I’d have to make things up, and I’m not going to do that.”

After describing deals Mueller could dangle in front of Stone -- and saying Stone would probably take a deal to avoid jail time -- Kirschner described Stone's legal dilemma after professing innocence.

"You're not necessarily guilty by association, Alex," he explained. "But you can attempt to commit a crime and that's a crime. Every crime on the books has an attempt crime attached to it. So if I attempt to rob a bank and I rent a car to use in the bank robbery, I get a gun, I drive to the bank but I see the guards outside and I abandon my plans, guess what? I'm guilty of attempted bank robbery."

Kirschner then dismissed Stone's belief that he is a lynchpin needed by investigators to nail Trump or that they need him to talk at all.

"The only thing that Roger Stone adds to the dialogue is carbon dioxide," he scoffed. "Beyond that, there is really no value to anything he says. We have to wait and see what Bob Mueller has."

You can watch the video below: