If you want to know, read about the Roman Republic and Julius Caesar. He was a popular general who defied the orders of the Senate, took his own loyal army and crossed a small river called the Rubicon to advance on Rome itself. In so doing he was making an irreversible decision to make war on the corrupt Republic that he used to serve. This is ignoring the centuries of dictatorship that followed in Rome, but I believe that Trump is more like Washington and will decline to be royalty.