In a normal democracy, he'll get arrested for doing that, no? :) Of course, if he refuses than he'll sure have a military power backing him, be it the police force or a part of the military or both. And that's just another coup, I expect the same response we showed against Jul 15th coup attempt: uprising and sane part of the military's action.

You would need a military who's primary mission is to uphold democracy in a non partisan way, much like the Turkish army since Ataturk's Reforms.

How likely do you think it is? To me extremely low.