John Demers

John Charles Demers (born September 21, 1971) is an Italian-born American lawyer who served as United States Assistant Attorney General for the National Security Division (NSD) from 2018 to 2021. He also served as acting United States Attorney General in his capacity as United States Assistant Attorney General for the National Security Division (NSD) for a few hours following the resignation of Jeffrey Rosen at noon on January 20, 2021 until President Joe Biden signed an executive order naming Deputy Assistant Attorney General for Human Resources and Administration Monty Wilkinson as acting United States Attorney General later that day.

As U.S. assistant attorney general for the National Security Division, Demers was the top official for national security at the U.S. Department of Justice (DOJ). During his tenure in the NSD, he was selected by Attorney General Jeff Sessions to lead the China Initiative and oversaw counterespionage operations in foreign intelligence. Although nominated by President Donald Trump, he also served under the Biden administration, where he was the longest-serving Senate-confirmed official from the Trump administration that was retained.

Demer's exit from the Justice Department garnered attention when the 2017–2018 Department of Justice metadata seizures became publicly known in June 2021, which coincided with his departure. He was eventually succeeded by Matthew G. Olsen. Demers returned to work at Boeing afterward, where he previously had been a vice president and general counsel leading the company's international defense, space, and security affairs.