The 31-year-old actor has joined the ensemble that includes Sebastian Stan, Samuel L Jackson, Peter Fonda, Amy Madigan, Christopher Plummer, Bradley Whitford, Michael Imperioli, Linus Roache, Grant Gustin and Alison Sudol.
Based on the true story of a present-day cover-up investigation, the film follows young Pentagon investigator Scott Huffman (Stan) as he unravels the injustice and battles the political machine in Washington.
Jagger will play the younger version of Jimmy Burr (the older version portrayed by Fonda).
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