Because he likes Mardi Gras
One aspect of the president's relationship with Congress is that the <span>Congress must approve any request from the president for military funding.
</span>
If the movie is perhaps a documentary, then it is telling you factual information of actual events (includes pictures or pictures of actual documents or events); this makes it a primary source.
If the movie is based off of real events, has factual information, but also has added information to create a well-rounded plot, this makes it a secondary source.