A French Catholic priest, he wrote a book recounting horrors committed by the Khmer Rouge that were responsible for the deaths of almost two million people.
The White House said the mystery drones flown across New Jersey were "authorized to be flown by the FAA" in the first press briefing of the second Trump administration.
A conflict that has raged for decades reached a flashpoint this week when rebels backed by Rwanda marched on a key Congolese city in a bid to occupy territory and exploit minerals.
He was a popular TV journalist when elected as El Salvador’s first modern-day leftist leader in 2009, but he went into exile hounded by corruption charges.