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Trump-Backed Challengers Threaten Senator Cassidy in Crucial Louisiana GOP Primary

Trump-Backed Challengers Threaten Senator Cassidy in Crucial Louisiana GOP Primary
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Sen. Bill Cassidy of Louisiana faced the toughest test of his career Saturday as Republican voters weighed whether to oust one of the seven GOP senators who voted to convict Donald Trump in 2021, in a three‑way primary that pitted him against a Trump‑endorsed congresswoman and a hard‑right state treasurer. The race, awash in more than $30 million in advertising and governed by newly tightened primary rules, threatened to make Cassidy one of the rare incumbent senators denied renomination in his own party. politico +1

Cassidy, a two‑term senator first elected in 2014, entered the May 16 primary trailing in most public polls behind Rep. Julia Letlow, Trump’s favored candidate, and State Treasurer John Fleming, another staunch Trump ally. An Emerson College survey in late April found Fleming at 28%, Letlow at 27% and Cassidy at 21%, signaling that the incumbent risked finishing third and missing a potential June 27 runoff entirely. cnn +1 The outcome will not likely change Republican control of the seat in November, but it will determine whether a rare GOP critic of Trump survives in the Senate. thehill

A Trump Revenge Test Wrapped in Louisiana’s New Election Rules

Trump turned Cassidy’s race into a centerpiece of his broader “retribution” drive, repeatedly blasting the senator for his impeachment vote and urging Louisiana Republicans to “CLOBBER” him while praising Letlow as a loyal ally who “will NEVER let you down.” nytimes +1 Outside groups aligned with Trump and with Health and Human Services Secretary Robert F. Kennedy Jr. also poured money into the contest, arguing Cassidy had obstructed key administration health nominees and MAHA priorities. cnn +1

At the same time, Louisiana’s switch from an all‑party “jungle” primary to closed party primaries altered the electorate in ways that likely hurt Cassidy, who previously benefited from crossover and independent support. politico +1 Reports of voter confusion were widespread, with Cassidy saying people had called his office to complain they “tried to vote for me, but they could not” under the new rules. washingtonpost Analysts viewed the rule change, backed by Republican Gov. Jeff Landry, as helping Trump‑aligned candidates by concentrating power in the most conservative GOP voters. politico +1

Establishment vs. Base: What’s at Stake for Both Parties

For Senate GOP leaders, Cassidy’s possible defeat threatened to shrink the already small bloc of Republicans willing to openly break with Trump. Senate Majority Leader John Thune publicly praised Cassidy as “a terrific senator for Louisiana,” underscoring establishment concern that Trump’s interventions could further remake the conference in his image. politico A Letlow or Fleming victory would reinforce the message that crossing Trump — even years ago — remains politically dangerous in safe Republican states.

Democrats, meanwhile, watched the contest less as a pickup opportunity than as a barometer of how far right the eventual GOP Senate caucus might tilt after November. Nonpartisan handicappers and prediction markets continued to rate the Louisiana seat as safely Republican regardless of the nominee. cnn +1 But losing Cassidy, who has occasionally worked on bipartisan deals on infrastructure and health policy, could further complicate cross‑party negotiations in a Senate Republicans currently control 53–47. cnn +1

The Bigger Picture

Whatever the final tally, Louisiana’s primary offered one of the clearest 2026 tests of Trump’s power to unseat sitting senators who defied him — and of whether establishment Republicans retain any meaningful protection for incumbents in deep‑red states. If Cassidy falls, it will signal that impeachment votes cast five years ago still define political futures; if he survives or Trump’s preferred challenger stumbles, it will suggest limits to the president’s grip even among the GOP’s most loyal voters.