In the form of government we actually have, Presidents don’t get to order Congress around.  Really, truly, seriously.  A President can persuade, he can ask, but he can’t tell a Member of Congress what they’re going to do.  They don’t answer to him.  They answer to their constituents, and any President who tries the heavy handed “I’m ordering you” approach is going to seriously piss off that member of Congress.   Congress doesn’t get to order the President around, either.   They can pass laws – but he can veto them.  They can withhold funds, but that doesn’t necessarily stop him.  There’s another balance in the equation as well. The courts.  You see, the courts get to decide what is or is not “allowed” according to the Constitution.  So either one or both has to answer to that law.

Oh, you want a dictatorship!