Overview

• Republican Rep. Matt Rosendale announces bid for U.S. Senate in Montana, challenging the GOP's preferred candidate, Tim Sheehy.
• Rosendale's entry into the race signals a bitter primary battle set for June 4, highlighting divisions within the Republican Party.
• Rosendale, a staunch conservative and Trump supporter, previously lost to Tester in 2018 but maintains significant support within Montana.
• Sheehy, a former Navy SEAL and political newcomer, has garnered support from national GOP leaders and prominent Montana Republicans.
• Democrats in Montana anticipate the Sheehy-Rosendale primary will weaken the GOP's standing among voters.