President Trump has been under constant siege from the beginning so Trump supporters tend to reflexively support whatever he does, whoever he endorses.
Personally, I believe we need to ignore his endorsements and primary out the Bush League Republicans or we will never be able to do the swamp draining that only we can do.
Re-electing the same Bush League Republicans who have been secretly and openly undermining his (and our) agenda is counter-productive.
He has endorsed McCain, Romney, Graham and others who are the very people pushing the policy of turning the USA into North Mexico that we elected Trump to reverse.
The weird thing is that his Attorney General pick was clearly FAR more socially conservative than either of his SCOTUS nominees (Barr is on record saying publicly on numerous occasions that Roe v. Wade was a terrible decision and should be overturned, that Christians are under attack in a culture war, etc., etc.), but some of Trump's biggest fans on here were vehemently AGAINST his Attorney General pick and kept sneering he was a "swamp creature"
I said it at the time and its even more obvious now, I would take his "bad" Attorney General nominee over his "originalist" SCOTUS nominees any day.