Jon Tester Stood with Dianne Feinstein in Fight for More Gun Control Posted on June 13, 2018 by Earnest Robie Just over two weeks after the June 12, 2016, Orlando Pulse nightclub shooting, Sen. Jon Tester (D-MT) supported Sen. Dianne Feinstein’s (D-CA) push for an expansion of gun control that would violate due process.