
(photo courtesy Utah State Historical Society) John F. Kennedy speaks at the Tabernacle at Temple Square on September 26, 1963.

1962 portrait of President John F. Kennedy seated at his desk in at the White House in Washington, D.C. (AP Photo)

In this Feb. 27, 1959 file photo, Sen. John F. Kennedy, D-Mass., is shown in his office in Washington. Monday, May 29, 2017 marks the 100-year anniversary of the birth of Kennedy, who went on to become the 35th President of the United States. (AP Photo, File)

FILE - In this 1938 file photo, John F. Kennedy, right, poses aboard an ocean liner with his father Joseph P. Kennedy, center, U.S. Ambassador to Great Britain, and brother Joseph P. Kennedy Jr., left. Monday, May 29, 2017 marks the 100-year anniversary of the birth of John F. Kennedy, who went on to become the 35th President of the United States. (AP Photo, File)

U.S. President John F. Kennedy and his wife Jacqueline Kennedy leaving church after Easter services at St. Edwards Catholic Church in Palm Beach, Florida on April 2, 1961. (AP Photo)

Hands reach out to greet President John F. Kennedy and first lady Jacqueline Kennedy upon their arrival at Dallas Love Field, Nov. 22, 1963. Later that day, the president was assassinated. (AP Photo)

FILE - In this June 6, 1983 file photo, Jacqueline Kennedy Onassis, left, and her son John F. Kennedy Jr., wait to hear a speech by Sen. Edward Kennedy at Brown University in Providence, R.I. Brown University said Friday, Oct. 13, 2017, the college application of John F. Kennedy Jr. that is now up for auction was stolen, and it wants the documents back. The website MomentsInTime.com put an $85,000 price tag on a collection of documents, including Kennedy's application and letters from his mother discussing his time at Brown. (AP Photo/Peter Southwick, File)

FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy waves from his car in a motorcade in Dallas. Riding with Kennedy are First Lady Jacqueline Kennedy, right, Nellie Connally, second from left, and her husband, Texas Gov. John Connally, far left. President Donald Trump, on Saturday, Oct. 21, 2017, says he plans to release thousands of never-seen government documents related to President John F. Kennedy's assassination. (AP Photo/Jim Altgens, File)

FILE - In this Oct. 15, 1962 file photo, John F. Kennedy, Jr., son of the president, watches from the rose garden with his mother Jacqueline Kennedy as his father gives a formal greeting to Algerian Premier Ahmed Ben Bella during ceremony on the White House grounds in Washington. A documentary film on John Kennedy Jr.'s life opens Friday, July 22, 2016, in select theaters. It also airs on Spike TV at 9 p.m. EDT on Aug. 1, and a DVD release is set for Aug. 16. (AP Photo/William C. Allen)

FILE - In this Oct. 1, 1961 file photo, President John F. Kennedy and first lady Jacqueline Kennedy leave St. Mary's Church in Newport, R.I., after Mass. The Rhode Island church, where the Kennedys wed on Sept. 12, 1953, is inviting visitors in to kneel where the couple knelt, listen to the music that played and imagine the day. (AP Photo/File)

FILE - In this Sept. 10, 1979 file photo, John Kennedy Jr. waits in registration line at Brown University in Providence, R.I., to register for his first year of college. A documentary film on John Kennedy Jr.'s life opens Friday, July 22, 2016, in select theaters. It also airs on Spike TV at 9 p.m. EDT on Aug. 1, and a DVD release is set for Aug. 16. (AP Photo/Constance Brown, File)

photo courtesy Utah State Historical Society
John F. Kennedy greets a crowd at the airport before giving a speech at Temple Square on September 26, 1963.

photo courtesy Utah State Historical Society
John F. Kennedy leaves the Hotel Utah before giving a speech at Temple Square on September 26, 1963.

photo courtesy Utah State Historical Society
John F. Kennedy greets people at the Hotel Utah before giving a speech at Temple Square on September 26, 1963.

FILE - In this June 5, 1961 file photo, Queen Elizabeth II poses with U.S. President John F. Kennedy, before a state dinner at Buckingham Palace. At left is the Duke of Edinburgh and Kennedy's wife, Jackie, is at second left. Monday, May 29, 2017 marks the 100-year anniversary of John F. Kennedy's birth. (AP Photo/Pool)
Washington • President Donald Trump acted Thursday to block the release of hundreds of records on the John F. Kennedy assassination, bending to CIA and FBI appeals to keep those secrets.
“I have no choice,” Trump said in a memo, according to White House officials. He was placing those files under a six-month review while letting 2,800 other records come out Thursday evening, racing a deadline to honor a law mandating their release.
Officials say Trump will impress upon federal agencies that JFK files should stay secret after the six-month review “only in the rarest cases.”
Much of Thursday passed with nothing from the White House or National Archives except silence, leaving unclear how the government would comply with a law requiring the records to come out by the end of the day — unless Trump had been persuaded by intelligence agencies to hold some back.
White House officials said the FBI and CIA made the most requests within the government to withhold some information.
No blockbusters had been expected in the last trove of secret files regarding Kennedy’s assassination Nov. 22, 1963, given a statement months ago by the Archives that it assumed the records, then under preparation, would be “tangential” to what’s known about the killing.
But for historians, it’s a chance to answer lingering questions, put some unfounded conspiracy theories to rest, perhaps give life to other theories — or none of that, if the material adds little to the record.
Researchers were frustrated by the uncertainty that surrounded the release for much of the day.
“The government has had 25 years_with a known end-date_to prepare #JFKfiles for release,” University of Virginia historian Larry Sabato tweeted in the afternoon. “Deadline is here. Chaos.”
Asked what he meant, Sabato emailed to say: “Contradictory signals were given all day. Trump’s tweets led us to believe that disclosure was ready to go. Everybody outside government was ready to move quickly.”
Trump had been a bit coy about the scheduled release on the eve of it, tweeting: “The long anticipated release of the #JFKFiles will take place tomorrow. So interesting!”
Experts say the publication of the last trove of evidence could help allay suspicions of a conspiracy — at least for some.
“As long as the government is withholding documents like these, it’s going to fuel suspicion that there is a smoking gun out there about the Kennedy assassination,” said Patrick Maney, a presidential historian at Boston College.
The collection includes more than 3,100 records — comprising hundreds of thousands of pages — that have never been seen by the public. About 30,000 documents were released previously — with redactions.
Experts said intelligence agencies pushed Trump to keep some of the remaining materials secret — the CIA didn’t comment on that.
Whatever details are released, they’re not expected to give a definitive answer to a question that still lingers for some: Whether anyone other than Lee Harvey Oswald was involved in the assassination.
The Warren Commission in 1964 reported that Oswald had been the lone gunman, and another congressional probe in 1979 found no evidence to support the theory that the CIA had been involved. But other interpretations, some more creative than others, have persisted.
The 1992 law mandating release of the JFK documents states that all the files “shall be publicly disclosed in full” within 25 years — that means by Thursday — unless the president certifies that “continued postponement is made necessary by an identifiable harm to the military defense; intelligence operations, law enforcement, or conduct of foreign relations.”
That doesn’t allow the president, for example, to hold some records back because they might be embarrassing to agencies or people.
“In any release of this size, there always are embarrassing details,” said Douglas Brinkley, a professor at Rice University.
The law does not specify penalties for noncompliance, saying only that House and Senate committees are responsible for oversight of the collection.
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Associated Press writers Alanna Durkin Richer in Boston and Calvin Woodward in Washington contributed to this report.
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