I think Mitch agreed to abandon Trump in exchange for keeping his senate seat. How else did he win reelection, in the face of historically low support, and despite the DNC dropping $100M on Amy McGrath?
Edit: I forgot to add that he OBLITERATED Amy McGrath. Not only that, but Amy is a DINO.
Mitch agreed? Hell, I think Mitch and other republicans were in on it from the very beginning.