Well, I think the answer here is that he never did. Him having easy, aligning goals to Trump is the only time he's ever had Trump on the same page as him. Trump was happy to leave Mitch the heavy lifting involved in some layups like SCOTUS noms, tax cuts and such.
“Jordan's campaign appears to have had systemic reporting problems over multiple years,” Brendan Fischer, director of reform at the Campaign Legal Center, told the Daily Beast.