Does having Donald Trump as President of the United States frighten me? Absolutely. He appears to be a loose cannon who might more effectively fight against the evils that assail us ... or he might turn his fire on all that is good in our country. Most likely, he will do both.
Am I panicking? Absolutely not. Frankly, I would probably be more afraid if it were Hillary Clinton in the White House, because she's a well-entrenched part of the system and would quickly settle into the job-as-usual. As happened with President Obama, Big Things Would Get Done.
I am not a fan of Big Things Getting Done when they are issues on which the country is deeply and closely divided.
Maybe with Republican control of both houses of Congress there might have been effective opposition to Mrs. Clinton, but I doubt this election could have produced that situation without also putting Mr. Trump in the White House. Even now, that control is tenuous.
I find a recent George Friedman essay to be somewhat comforting. Once again he points out the limited powers of the president, especially an unpopular one.
[The American presidency] is the most noted position in the world, imbued by observers with all the power inherent to the world’s most powerful country. Everyone is now trying to understand what Trump intends to do.
At the same time, the American president is among the weakest institutional leaders in Euro-American civilization. He can do some things unilaterally, particularly in foreign policy, but Congress can block them. He can do some things by executive order, but the Supreme Court can overrule them. He can pass certain programs that require cooperation from states, but the states can refuse to cooperate. At every step, as the founders intended, his ability to act unilaterally is severely limited.
[The defection of only three Republican senators would] make it impossible to pass any proposed legislation. As such, any Republican senator who can position himself as a potential defector will be able to negotiate for the president’s support on any number of issues. The president will either be forced to compromise or risk having the legislation defeated.
Senators are not free actors. They need to be re-elected. Their calculation on whether to oppose a Republican president will depend heavily (if not entirely) on whether the president will help or hurt them in their re-election bids. That depends on the president’s approval ratings, particularly in the senators’ home states.
Trump’s approval ratings are unlikely to fall below [the current] 37%, but to be effective, he can’t stay at that level. Republican senators will look at the president’s negative ratings in their states and calculate whether supporting his programs might lock 50% of voters against them. It is important to recall that constitutionally, a senator is supposed to serve the people of his state, not the president.
I confess I'm not completely comfortable with that much "power to the people"—largely because approval ratings give more power to the loudest and most obnoxious among us. But there it is. Speak up or be left out.