Tim Wu: What really saved the republic from Trump?

Americans are taught that the main function of the U.S. Constitution is the control of executive power: curtailing presidents who might seek to become tyrants. Other republics have lapsed into dictatorships (the Roman Republic, the Weimar Republic, the Republic of China and so on), but our elaborate constitutional system of checks and balances, engineered largely by James Madison, protects us from despotism.Or so we think. The presidency of Donald Trump, aggressive in its autocratic impulses but