There is a movie in which the ancestor of the hero is suspected of assassinating Lincoln. However, he is looking for treasure, at the president's desk.

National Treasure: Book of Secrets (27)

Also known as National Treasure: Secret of Ancient Books (Hong Kong)/Amazing Treasure: Century Secret Book (Taiwan)/National Treasure 2: Secret Book/National Treasure 2

Adventurer Ben? Gates (Nicholas? Cage is a more difficult adventure and treasure hunt. Abraham, the 16th president of the United States? Lincoln's death has always been an unsolved case in American history. Vauxs? Booth was actually instigated to commit a shocking murder. Gates took part in a public speech, and the audience was named Mickey? Wilkinson (Ed? Harris) claims that Gates' grandfather is inextricably linked to Lincoln's death. So Gates began to investigate John? Booth related clues, found a book called "National Tantric", is the key to answer all questions.