Jack Schlossberg, the only grandson of President John F. Kennedy, was not among the many people poring over the new trove of government files about Kennedy’s assassination when it was released Tuesday. Instead, Schlossberg was on social media criticizing President Donald Trump, Republican lawmakers and the news media over the handling of the files.

The long-awaited release could shed more light on what Fidel Castro or the CIA knew before the 1963 killing.