U.S. Sen. Jon Tester, a Democrat from Montana seeking re-election to a fourth term, is seen at a campaign rally in a hotel ballroom, Oct. 25, 2024, in Bozeman, Mont. (AP Photo/Matthew Brown)

Supporters of U.S. Sen. Jon Tester, a Montana Democrat, are seen during a campaign rally for the three-term incumbent lawmaker in a hotel ballroom, Oct. 25, 2024, in Bozeman, Mont. (AP Photo/Matthew Brown)

Sen. Jon Tester, a Democrat from Montana seeking re-election to a fourth term, speaks with a supporter during campaign rally in a hotel ballroom, Oct. 25, 2024, in Bozeman, Mont. (AP Photo/Matthew Brown)

Josh Olsen, an outdoor guide and Democrat, speaks about the 2024 election during a campaign rally for U.S. Sen. Jon Tester as the lawmaker seeks re-election to a fourth term, Oct. 25, 2024, in Bozeman, Mont. (AP Photo/Matthew Brown)

FILE- Republican presidential nominee former President Donald Trump shakes hands with Montana Senate candidate Tim Sheehy at a campaign rally in Bozeman, Mont., Friday, Aug. 9, 2024. (AP Photo/Rick Bowmer, File)

FILE - U.S. Senate candidate Tim Sheehy talks about his campaign, Friday, Feb. 9, 2024, in Helena, Mont. Sheehy is seeking the Republican nomination to challenge U.S. Sen. Jon Tester in the November election. (AP Photo/Matthew Brown, File)

Sen. Jon Tester, a Montana Democrat, speaks to supporters during a campaign rally at a hotel ballroom, Oct. 25, 2024, in Bozeman, Mont. (AP Photo/Matthew Brown)