They will 100% be backing Desantis (if he enters.) Same with the Bush Family.
They might if he’s a vague challenger. But once he is a nominee or president they will call him 100x worse than Trump. And for their purposes he probably will be. I have no idea how DeSantis will be, but he’d probably nominate conservatives for the Supreme Court.
"They?"
The Democrats don’t have much to go on right now, all they have is creating a totally false narrative about hostility between Trump and DeSantis.
There will be useful idiots and secret operatives who push this and buy into it. But please don’t let your friends get suckered by this journalistic trickery.