Trump's move came on the deadline he imposed
last year for the full release of the files -- barring national security and privacy concerns -- after the 25-year-in-the-making deadline imposed by the John F. Kennedy Assassination Records Collection Act came to pass last October.
"I agree with the Archivist's recommendation that the continued withholdings are necessary to protect against identifiable harm to national security, law enforcement, or foreign affairs that is of such gravity that it outweighs the public interest in immediate disclosure," Trump said in a presidential memorandum on Thursday.
The memorandum accompanied a release of about 19,000 documents by the National Archives in compliance with the records law and Trump's order last year.
Many of the documents released Thursday contain redactions, and they join the massive trove of Kennedy assassination records that already have been made public.
Kennedy's 1963 assassination prompted a whirlwind of questions from the public and researchers, plenty of conspiracy theories and reflexive secrecy from the government.
In 1992, President George H.W. Bush signed the JFK Assassination Records Collection Act, requiring the release of all records relevant to the assassination by the year 2017.