President-elect Donald Trump said on Sunday he would release classified documents in the coming days related to the assassinations of U.S. President John F. Kennedy, Senator Robert Kennedy and civil rights leader Martin Luther King Jr.

Trump, returning to the White House, vowed to release classified documents on the JFK assassination and others. While he previously released some files, many remain classified due to national security concerns.

Trump’s decision to release these files comes in the wake of strong advocacy from Robert F. Kennedy Jr., the nephew of RFK, who has long pushed for the declassification of documents related to his uncle’s assassination.