Later this year - unless President Trump intervenes - the American people will get access to the last of thousands of secret government files about a turning point in the nation's history: the 1963 assassination of President John F. Kennedy. The National Archives this week released several hundred of the documents, which come from CIA and FBI files. JFK researchers are scrambling to see whether they contain any new clues about the president's murder. But many more documents remain under seal, awaiting release by this October, the 25-year deadline set by the 1992 Kennedy Assassination Records Collection Act. The law gives only one person - the president - the ability to stop the release from happening. He can act only if he certifies in writing that the documents would somehow endanger national security. About 3,150 ... documents remain totally under seal, along with tens of thousands of pages that have been only partially unsealed because intelligence and law-enforcement agencies opposed their release in the 1990s. Those are the documents that Trump could try to keep secret. And sadly, he appears to be under pressure to do so. Congressional and other government officials have warned us in confidence in recent weeks that at least two federal agencies will make formal appeals to the White House to block the release of some of the files. Which agencies? Which files? The officials would not say. Trump ... has a chance to show that he is committed to resolving some of the biggest conspiracy theories in American politics. We hope he welcomes the opportunity.