Under the deadline set by a 1992 law, Trump has six months left to decide whether he will block the release of an estimated 3,600 files related to the assassination of John F Kennedy.
Most of the JFK documents come from the FBI and CIA, and releasing files may help solve the mystery of his death.
The White House acknowledged there's a decision to make, but they haven't given away what his position on the issue is.
A White House official says the Trump administration is familiar with the requirements of the 1992 law and that White House is working with National Archives to enable a smooth process in anticipation of the October deadline.
Some documents contain missing files from a CIA operative that followed Oswald to Mexico a week before JFK's death.