The Washington Post reported that Trump had been urged by government agencies, including the CIA to keep the documents secret.
Over the years, the National Archives have released most of the documents, either in full or partially redacted.
Assassination experts say the secret records may reveal new details about what the Central Intelligence Agency knew of assassin Lee Harvey Oswald's trip to the Soviet and Cuban embassies in Mexico City weeks before he shot Kennedy in Dallas on November 22, 1963.
After nearly 54 years of questions and conspiracy theories, the world may finally learn all that was officially recorded about the assassination of President John F. Kennedy. But one final batch remains, and only the USA president has the authority to extend the papers' secrecy past the deadline on October 26, according to local media reports.
Scholars have been speculating for weeks whether Trump would release the documents related to Kennedy's death. But Trump's longtime confidant Roger Stone told conspiracy theorist Alex Jones of Infowars this week that he personally lobbied Trump to publish all of the documents. Ted Cruz (R-Tex.) had been with accused assassin Lee Harvey Oswald before the shooting, a suggestion that offended and angered Cruz, who called then candidate Trump a "pathological liar".
If you think the government is hiding something about the Kennedy assassination, you may get to see what it is.
Phil Shenon, who wrote a book about the Warren Commission, the congressional body that investigated Kennedy's killing, said he was pleased with Trump's decision.
Others wanted nothing held back and some news outlets were suggesting the timing of the release might help distract from allegations of the President's possible ties to Russian Federation. Still a small portion, about 3,100 documents created inside the CIA, FBI and Justice Department, have been held back until now.