There Isn’t a Constitutional Deus Ex Machina
One unfortunate tendency since the election is for people to think that there is some magical clause in the Constitution that will prevent Donald Trump from becoming President or that will make his presidency a short one. Faithless electors will vote for Hillary! Trump will be violating the Foreign Emoluments Clause! (which, let’s face it, hardly anybody thought about until 2016). Perhaps we will hear other candidates soon.
There may well be valid constitutional objections to specific things that the President-elect proposes, for many things there will be none. (Rescinding some of President Obama’s executive orders, for example.) Public opinion will be the only check on these sorts of actions, either on the Administration itself or through the Congress.