The chemical weapons attack in Idlib is only the latest in a series of attacks on the 2 million people now living in the province--including 700,000 who had already fled fighting in other parts of Syria. What's worse, the attack happened during the latest declared ceasefire in a six-year-long war with no end in sight.

It's a fundamental right guaranteed to all by the U.S. Constitution. But due process is facing unprecedented challenges today. Here's what it is and why it matters to everyone.