"First you push your powers to rule by decree - claiming you are obeying the will of the patriotic people who elected you. You proclaim that the country is under an immediate, existential threat from outside such that the only warning you'll get of them coming is the H-bomb detonated 20 miles over South Dakota to fry all the electricals; then all the immigrants who came in in the meantime will suddenly rise up and overpower everyone because they learned to live without electricity. Unless I have total and immediate power, America can DIE on a moment's notice and there'll be nothing you can do to stop it."
There, FTFTFY. And yes, there really are people out there who honestly believe it.