When President Donald Trump announced an executive order Thursday to release the remaining government files in three of the country’s most notorious assassinations, it immediately grabbed public attention and raised intrigue.

There’s always the possibility that something would slip through that would be the tiny tip of a much larger iceberg that would be revealing,” said Larry J. Sabato, director of the University of Virginia Center for Politics.

Under the order, intelligence officials must present a plan within 15 days for the “full and complete release” of records on the assassination of John F. Kennedy, who was shot to death in Dallas in November 1963.