It is just petulant child president lashing out, and toadies doing what he says, currying favor with him or with the Fox base.
There is no chance that an investigation of the President occurred without multiple levels of authorization. None.
No FISA warrant would be granted based solely on a dossier written by a foreigner. There is also SIGINT.
“Spying” is not the same as “investigating.” And the former didn’t happen.
This has nothing to do with dems vs. Reps. This is professional law enforcement and counter-Intelligence vs. Trump.