Then there's Trump, who would be in one of the newer right-wing populist parties, and the religious fundamentalists who wouldn't fit into any party in most European countries.
In policy matters, Trump would still be in Liberal. He isn't threatening to ban importing tropical fruit for example, and he is far more hostile to the idea of a safety net than is the Danish People's Party.
There's no way he'd be in a classical liberal party. He has, at times, said he supports universal government-provided healthcare, and he favors heavy protectionism, both of which put him at odds with liberal economics. His erratic, right-wing populist message would also not fit with a liberal party.