He's acting like a NAZI in every relevant way except the symbolic and superficial. (Well... except for that one very public time.)
He's very aggressively and openly supporting far-right parties, including the AfD in Germany.
He's suggested to Germans to get over the shame of their past -- guess what he's referring to here!
He basically owns the US Executive branch in the same way that fascists "integrate" business and politics.
He loves to single out vulnerable minority groups for public vilification (the transgendered), including personally taking steps to materially harm them.
Him and Trump together want to control the racial makeup of the country, and have collaborated on mass arrests and deportations.
Etc...
If it walks like a duck, quacks like a duck, and salutes like a duck...