Oh, boy. The Koch-Trump battle escalates…

Steve Bannon has a warning for candidates supported by the conservative Koch political donor network - just ahead of crucial midterm elections this fall.

“You take Koch money, it’s going to be toxic. We are going to let people know that if you take Koch money there’s a punishment,” Bannon, former chief White House strategist and Trump campaign chief executive, told CNBC in an exclusive interview. “If you take money from people who are against the president and are looking to put a knife in the back of the president, you are going to pay.”

The strategist declined to elaborate on what the punishment would look like.

Does Bannon even have any political juice left at this point?