The second Democratic presidential debate is upon us, which can only mean one thing: The 20 candidates hoping to boot President Trump out of office will be fighting for airtime and desperately searching for momentum before the lights go out at campaign headquarters.

But this debate shouldn’t just be about healthcare reform, immigration and ICE, Trump’s personality, and mandatory minimum sentencing. There are very serious developments happening outside U.S. borders. The contest for president is also a contest for commander-in-chief. There is a tendency for foreign policy to change the entire course of a presidency. Just ask George W. Bush.