This Aug. 31, 2018 photo shows Montana U.S. Sen. Jon Tester, right, listening to Brandon Judd, president of the National Border Patrol Council, speak about border security and immigration during a campaign event in Billings, Mont. Outside groups and donors have poured more than $45 million into the race between Tester and Republican State Auditor Matt Rosendale. (AP Photo/Matthew Brown)
BILLINGS, Mont. (AP) — Outside groups and individual donors have poured more than $45 million into Montana’s U.S. Senate race as President Donald Trump prepares a third trip to the Big Sky state in his crusade to unseat two-term Democratic Sen. Jon Tester.