People use the term fascism in many ways. The American left often focuses on militarism. To many of them, rounding up criminals who migrated illegally feels fascist, because it feels militaristic even if it is just law enforcement doing their job. If Trump suggests some abnormal law enforcement to make it happen because normal law enforcement isn't doing it, thn this feels fascist to the American left, it feels like a misuse of power. Of course this isn't the meaning of fascism that you describe. Unfortunately the characteristics of Mussolini are multifarious and so the term fascism is tortured and hard to understand outside of a given context.
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