There are three interlocking reasons why our confidence in the system is naïve. For one, we’re in genuinely uncharted territory with Trump: we’ve simply never seen a candidate with this much disregard for typical Constitutional values get this close to the White House. There’s no precedent for what might happen if he got there. For another, if you look at how our system of checks and balances is really built, it has relatively few resources to stop an authoritarian president from violating the Constitution and getting away with it. And the third reason may be the most unsettling of all: In a democracy, the final brake on the tyrannical exercise of power is public opinion. And polls suggest the American public has never been as skeptical of democracy or as open to authoritarian alternatives like military rule as it is right now. If a President Trump really blew down the walls of our system, a worryingly wide swath of the public would likely stand behind him.