I think some of the Congress Republicans are afraid they're going lose their re-election bids if Trump turns against them, as he apparently has huge swathes of deeply loyal supporters.Well, they have for quite some time now.....
And it is not as if they were upstanding pillars of the community known for their strong morality, right?
Some might also be worried about what the political landscape is going to look like after this so-called president has been removed from office, as he could still wreak havoc for the Republicans by urging his fan-base to boycott the elections or support some third-party candidate, thereby splitting the party and leaving the door open for the Democrats.