For the first, the model is Franklin Delano Roosevelt. But FDR was repeatedly blocked by the courts, as Trump would surely be if he sought to exercise dictatorial power. With the Senate on his side, however, he could appoint Trumpian judges and justices; he could even beat the Supreme Court into submission by threatening to pack it as Roosevelt did. Still, I think none of this will come to pass. Even if Trump is elected, he will not have FDR’s majorities in Congress, or last as long as FDR, or command as much popular support. Working with congressional support, he could do some of the things he says he wants to do—end Obamacare and build a Mexican Wall (assuming that he really wants to do these things, which I doubt). But then by definition he is not acting as a dictator. The possibility that a president Trump uses a temporary political majority to strengthen executive power and demolish the remnants of the opposition, in the manner of Hugo Chávez, is a possibility but not one that is (yet) worth considering.