A talking point right now among pundits is that Trump will run for reelection to inoculate himself from prosecution.
I don't believe Trump actually thinks he'll innoculate himself from prosecution by declaring himself a candidate.
I believe it's a way to keep himself at the center stage of the GOP by presenting himself as the target of left-wing radical hated.
It will be his rallying cry. A way to eclipse DeSantis. A way to keep the donations flowing in.