That’s because they’re scared of him and the MAGA crowd. Right now he still wields power in the GOP and with the Midterms coming no one wants to piss him off. They’ll start to break with him not long after November, he’s already playing Vance and Rubio off against each other in terms of who he will give his backing to.
They both know that his policies are unpopular with the majority so they’ll need to distance themselves if they don’t want to get tagged as more of the same.