Do you mean Trump loses the election in 2020 and declares Marshal Law (or whatever) to retain control? I ask because I can recall that that accusation was leveled against Bush2 (by the Dems) and against Obama (by the Reps) so both sides of the aisle are guilty of spinning fantasy theories to rile their base.
More importantly... a while back, I heard it much mentioned that Trump removed the SS director to counter a deep state plot to JFK him (i.e. assassinate him).
Do you see what I did there? If this type of arbitrary, unfounded discourse continues between the parties (and their respective bases) and no common ground can be found it's only a matter of time before America is destroyed and collapses into a dictatorship, it does not matter if said dictator is from the left or from the right.