In the sequel to the original 2004 film, black market dealer Mitch Wilkinson locates one of the 18 missing pages of John Wilkes Booth's diary and suggests that Ben's ancestor, Thomas Gates, was a conspirator in the assassination of President Abraham Lincoln, so Ben sets out to prove his innocence by kidnapping the current U.S. President and by finding the disappeared hidden truth.

What's the best answer to this question: is there a sequel to the movie national treasure?
yes