Compare his stance on immigration to the fascist parties I mentioned. It's basically the same thing.
*sigh*
Ok, let's go at it this way. The concepts usually attributed to fascism are:
Nationalistic: Has he called for turning the nation inward? No.
Authoritarian: Has he called for the creation of a single-power police state? No.
Militarism: Is militarizing the border the same as militarizing the nation? That's probably debatable.
Corporatism: Does he report to and/or empower an unelected body that exerts control over a region or industry? If you don't count his constituents, none comes to mind.
Collectivism: Does he endorse the Borg mentality? No.
So far, you're striking out.