On the 50th Anniversary of John F. Kennedy's assassination, author James Swanson shares the stories he learned while writing his book, "The End of Days: The Assassination of John F. Kennedy". (The Washington Post)

Though Kennedy assassination experts say that they do not think the last batch of papers contains any major bombshells, the president’s decision to release the documents could heighten the clarity around the assassination, which has fueled so many conspiracy theorists, including Trump.

In May 2016, while on the presidential campaign trail, Trump gave an interview to Fox News strongly accusing the father of GOP primary opponent Sen. Ted Cruz (R-Tex.) of consorting with Kennedy assassin Lee Harvey Oswald right before the shooting.

Some Kennedy assassination researchers think that the trove could shed light on a key question that President Lyndon B. Johnson tried to unsuccessfully put to rest in 1963: Did Oswald act alone, or was he aided or propelled by a foreign government?

The records are also said to include details on Oswald’s activities while he was traveling in Mexico City in late September 1963 and courting Cuban and Soviet spies, as well as the CIA’s personality profiles written of Oswald after the assassination.

But some experts fear the history that may be lost forever in unreadable documents in the trove. One listed as “unintelligible” is a secret communication from the CIA to the Office of Naval Intelligence about Oswald in October 1963 — weeks before the assassination. Oswald had been honorably discharged from the Marine Corps in 1959, but it was later changed to a dishonorable discharge. He was outraged and made threats late in 1963 when he learned the military had rejected his appeal of its decision.

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 to release the documents. But he wonders to what degree the papers will ultimately be released.

“It’s great news that the president is focused on this and that he’s trying to demonstrate transparency. But the question remains whether he will open the library in full — every word in every document, as the law requires,” Shenon said. “And my understanding is that he won’t without infuriating people at the CIA and elsewhere who are determined to keep at least some of the information secret, especially in documents created in the 1990s.”

There are about 3,100 previously unreleased files that hold tens of thousands of pages of new material. The National Archives also has another 30,000 pages with information that has been disclosed before, but only partially and with redactions.

Jefferson Morley, a former Post reporter who has studied the Kennedy assassination records for years, said that the last tranche of material is also intriguing because it contains files on senior CIA officials from the 1960s — officers well aware of Oswald’s activities in the days before the assassination.

He specifically pointed to the files of former CIA officers William K. Harvey and David Phillips. Morley said Harvey led the agency’s assassinations operations and feuded constantly with Kennedy’s brother, Robert F. Kennedy, over the administration’s crisis with Cuba. Phillips, Morley said, oversaw the agency’s operations against Cuban President Fidel Castro and was deeply familiar with the CIA’s surveillance of Oswald in Mexico City.

“What’s in those files could tell us how those men did their jobs,” said Morley, who wrote a 2008 book on the agency’s Mexico City station chief. “There might be stuff on why we were interested in the Cuban consulate, how we surveilled the consulate, how we did our audio work, and how did we recruit spies there? We might understand much better why they were watching Oswald.”

John Wagner and Carol D. Leonnig contributed to this report

(The Washington Post)