Quotes from the news wire:
He really doesn't want to talk about the pandemic, which is all everyone in America is thinking about, it's the same thing with the Black Lives Matter protests, as well. He really didn't want to talk about George Floyd, which is what everyone in America was talking about for a month. When you have that kind of disconnect between the leader and the voters you see it in the potential [ electoral ] wave that is now more likely than not.
Every member has their own calculus and certainly some of them are taking a principled position, regardless of the politics, but for the vast majority of Republican members, the lesson of the last two years is don't comment on Trump's tweets because they have a short shelf life, but the damage you can do to yourself can be permanent.