Billy Jack Goes to Washington

Released 1977
Stars Tom Laughlin, Delores Taylor, E.G. Marshall, Sam Wanamaker, Lucie Arnaz
Directed by Tom Laughlin

The fourth and final "Billy Jack" film. Billy Jack is pardoned by the governor and appointed to a vacant U.S. Senate seat as a political maneuver to win the youth and minority vote for the governor. When he reaches Washington D.C., he discovers the corruption of the Senate is beyond repair, and becomes determined to stir things up on the Senate floor.

Summary from netflix.com