'Tester knows defending Montana starts with securing the border': A new campaign ad argues that Democratic Sen. Jon Tester of Montana has cracked down on border security amid his contentious reelection bid, despite him having a history of voting down several security measures. Tester launched an ad last week claiming to have fought alongside Republicans for shutting down the border, targeting fentanyl traffickers, adding Border Patrol Agents and supporting the “Remain in Mexico” policy. However, the senator has repeatedly opposed GOP-led measures aimed at strengthening border security. “When Montanans see a problem, we get to work,” the ad narrates.