NEW ORLEANS — Sen. Bill Cassidy faces a make-or-break moment in Louisiana's Republican primary Saturday, with President Donald Trump throwing his weight behind a challenger in an unprecedented bid to punish the incumbent for perceived disloyalty. Trump endorsed U.S. Rep. Julia Letlow, calling Cassidy a “disloyal” figure who betrayed the party by voting to convict the president in his second impeachment trial.
“This is a defining test of Trump's influence within the GOP,” said Dr. Emily Hart, a political analyst at Tulane University. “If Letlow wins, it signals that crossing Trump remains a career-ending move.” The primary has become a flashpoint in the broader battle over party loyalty, pitting a two-term senator against a first-term congresswoman backed by the former president.
Background
Cassidy, a physician, voted to convict Trump in February 2021 after the Jan. 6 Capitol attack, one of seven Republican senators to do so. That vote made him a target for Trump, who has since vowed to purge the party of dissenters. In 2024, Trump endorsed Letlow, who won a House seat in 2021 after her late husband's election.
Cassidy also clashed with Health Secretary Robert F. Kennedy Jr. over vaccine policy, even though he provided critical support to help Kennedy get confirmed. This dual defiance — against Trump and Kennedy — has energized conservative activists against him.
What This Means
The outcome will ripple beyond Louisiana. A Cassidy loss would embolden Trump to target other incumbents who crossed him, reshaping the GOP's internal dynamics. Conversely, a win for Cassidy could signal that Trump's endorsement power has limits.
“This race is a bellwether for the 2026 midterms,” said James Mitchell, a political strategist based in Baton Rouge. “If Trump loses here, other establishment Republicans might feel safer defying him.”
The primary is also a test of Letlow's ability to rally Trump's base while Cassidy leans on his record and incumbency. Both candidates have ramped up advertising in the final week.
See background above for more details.