Obama prob got one of his Judges to ok the spying.
Of course Trump and Session know this, so there can be no prosecutions of Obama people.
Otherwise his tweeting about it could undercut the case, and give Obama a heads up.
REPEAT......Trump would not have tweeted if they had anything actionable.
Then President Trump loses big time, and in the end will be portrayed as a false accuser, a liar, a hysteric, or a mad man.
None of those are "winning."
The only "winning" on this issue is to start putting Obama and his paid thugs before a Grand Jury.