One of the key moments of Donald Trump's speech Thursday night came when he spoke about 21-year-old Sarah Root while criticizing immigration policies. Root, he said, was "just one more American life that wasn’t worth protecting. One more child to sacrifice on the altar of open borders." Trump said a "border crosser" had killed Root, though he didn't provide details, and the Washington Post fills in some background: Police say that 19-year-old Eswin Mejia, an undocumented immigrant from Honduras, was drunk when he slammed his pickup truck into the back of Root's SUV at a high rate of speed in January of this year. Mejia, who was believed to be drag racing at the time, posted bond days later and hasn't been seen since. Root was from Council Bluffs, Iowa, and had graduated from Bellevue University near Omaha the day before the crash. Related coverage: