“I’m sure he learned a lot, during 4 years in the world’s toughest job.”
I see no evidence of that (in regards to his endorsements). Trump doesn’t know the people who he’s endorsing. He’s relying on advisors. More than likely the same advisors who convinced him to endorse Mitch McConnell, Lindsey Graham, Mitt Romney, Ben Sasse, Bill Cassidy, Kevin McCarthy...
Hageman is just the latest dubious endorsement.
Who do you think would have been a better endorsement?