Even if you don't want to endorse a candidate, you can still denounce one. A decision not to denounce Trump and all that he stands for can easily be viewed as tacit acceptance.
I just think it's strange considering Trumps history with Besos. They weren't exactly friends unless something changed. Not really sure what the calculus is here.
Don't get on his bad side? Not that they aren't already at odds, just remember T is highly transactional and this could be seen as a favor that may buy some brownie points.