Was contemplating this last night. I suspect more is going on.
He'd been with the particular congregation he's leaving for 4 years. But his personal tension started when DJT announced his run for president. So, what church is he leaving? Possibly he needed to have checked out the church more before he accepted their call?
I note that the story didn't talk with any of his congregation.
My own pastor only talks politics obliquely. I'm glad of it. My own personal politics is not going to fit well anywhere.
There is well founded rumor that he wanted to do a gay wedding and was shot down. The church changed its marquee a couple years ago from a cross to four rainbow colored arrows pointing inwards to form a cross.