How many Prssidents have had an FBI investigation over their head?
Nixons crimes would have led to Obstruction of Justice charges
Trumps crimes would lead to Treason
Several, including your favorite, William Jefferson Clinton.
Would? How about "could". You have no evidence, only conjecture and wet dreams. If he's guilty, he should be charged and convicted. If not, what next? You've been bitching about Trump for the past five months, ever since your candidate Hillary lost in an upset election.
Powerful people like Hillary and Trump have a lot of "buffers". If anyone is convicted, it's most likely to be a Trump lackey, not Trump himself. If anyone in the Trump campaign is convicted of colluding with the Russians, would you be satisfactorily entertained if he/she is publicly executed in Lafayette Square?