You are kidding aren't you. What kind of crisis would you be thinking that he would be making? Do you think that the legislative arm of government would just sit back and let that happen? Do you think the Military leadership would just sit back and let the President become a dictator? Have you ever heard of checks and balances? Some folks seem to think the the POTUS has super powers, and that is what such a take-over would take. Who tells you this stuff and why in the world would you fall for it?
There are, sometimes, some really silly propositions put forth on this forum, but this one should be in Disney World with Goofey.