Trump loyalty tests and major battlegrounds: What to watch in Rep. Thomas Massie’s primary and other Tuesday elections

President Donald Trump’s campaign to suppress dissent in his own party faces its most prominent test yet as he takes aim at Rep. Thomas Massie in Kentucky, while GOP candidates across the country look to leverage the president’s endorsement in key primaries.

President Donald Trump’s campaign to suppress dissent in his own party faces its most prominent test yet as he takes aim at Rep. Thomas Massie in Kentucky on Tuesday, while GOP candidates across the country look to leverage his endorsement in key primaries.

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So far, Trump’s push to defeat Republicans who have crossed him has succeeded in other May primaries, ousting several Indiana state lawmakers and ending Sen. Bill Cassidy’s congressional career Saturday in Louisiana.

But it’s Massie who has drawn the most attention from Trump amid repeated clashes with across multiple issues, which prompted Trump’s political operation to pour resources into the campaign. Massie’s primary against Trump-backed former Navy SEAL Ed Gallrein has drawn more ad spending than any House primary in U.S. history, according to the ad-tracking firm AdImpact.