Should Trump actually get elected (which I very strongly doubt, seeing as he does this every election cycle but never goes tries to go beyond the primaries), he won't be another Hitler or Mussolini, but rather just a typical Republican plutocrat. Focus on foreigners and immigrants in particular during his campaig in order to secure the usual redneck vote as well as to avoid talking about his economic policies, then once in power, handouts out the ass for big business (himself very much included) at the expense of everyone else. In other words, business as usual for the US government.
But yeah, it's never actually going to happen.