Trump claimed Epstein had poached staff from his Mar-a-Lago estate during an impromptu press conference aboard Air Force One on Tuesday. He specifically named Giuffre, who had worked as a locker room attendant at the Florida resort during the summer of 2000, when she was 16. "Everyone knows the people that were taken," Trump said.

The test was conducted in U.S. public schools for decades until it was retired by the Obama administration. Here’s what to know about it and why Trump wants it back.