"Fascism is a form of government which is a type of one-party dictatorship."
So if you silence people who disagree with your views and everyone in your party has similar views it's pretty darn close.
The left even wants to impeach Trump and have tried 4 different ways to do it so far. It's not because he is corrupt as all politicians through all of history have been, it's because of his means and message that run counter to the leftist agenda. Not accepting a democratic result because it clashes with your values is also fascist.