“Tester started throwing out things that he’s heard. Well, I know things about Tester that I could say, too,” Trump threatened at a rally in Washington Township, Michigan. “And if I said them, he’d never be elected again.” (Trump did not say what these things were).

Tester, the top Democrat on the Senate veterans’ affairs committee, contended this past week that there his office had been told of numerous allegations of inappropriate workplace behavior by Jackson, including excessive drinking on the job and over-prescribing medications. Those accusations led Jackson to withdraw his nomination for the position.

While President Trump has singled out Tester, both in a series of morning tweets on Saturday and at his rally, for upending the nomination process, several Republican senators involved in the vetting process told The Daily Beast that the White House had not done a good enough job preparing Jackson for the nomination.