NEW ORLEANS — In an extraordinary bid to purge the Republican Party of perceived disloyalty, President Donald Trump has endorsed U.S. Representative Julia Letlow against incumbent Senator Bill Cassidy in Louisiana’s Saturday primary. This high-stakes challenge follows Cassidy’s vote to convict Trump in his second impeachment trial for the January 6, 2021 Capitol attack.
“Senator Cassidy is a disloyal disaster,” Trump said in a statement, calling him a “RINO” (Republican In Name Only). “We need real Republicans who will fight for the America First agenda.” Letlow, a first-term congresswoman from northeastern Louisiana, has aligned herself with Trump’s platform.
Cassidy, a physician and senior senator, is the first incumbent to face a Trump-backed primary challenger this cycle. Polling shows a tight race, with Cassidy relying on his record of disaster relief and healthcare while Letlow highlights her loyalty to Trump.
“This is a test of Trump’s enduring influence within the GOP,” said Dr. Sarah Miller, a political scientist at Tulane University. “If Letlow unseats a sitting senator, it sends a message: crossing Trump carries electoral consequences.”
Background
Cassidy was one of seven Senate Republicans who voted to convict Trump after the Capitol riot. He later supported bipartisan infrastructure legislation and clashed with Health Secretary Robert F. Kennedy Jr. over vaccine policy—despite providing crucial support for Kennedy’s confirmation.
“I did my duty under the Constitution,” Cassidy said in a campaign ad. “Now I’m fighting for Louisiana families.” His campaign stresses his seniority on the Senate Energy and Natural Resources Committee, which benefits the state’s oil and gas industry.
Letlow, who entered Congress in 2021 after her husband’s death, has run on a platform of “faith, family, and freedom.” She rarely criticizes Cassidy directly but emphasizes her 100% voting record with Trump’s positions.
What This Means
The primary outcome will signal the degree of party orthodoxy demanded by the pro-Trump base. A Letlow victory could discourage other Republicans from breaking with Trump on key votes. A Cassidy win would show that even Trump’s endorsement has limits when pitted against incumbency and local service.
National Republican groups have largely stayed neutral, though the Senate Leadership Fund (aligned with Mitch McConnell) has run ads praising Cassidy’s work. “This race is about who gets to define the Republican Party: the establishment or the Trump movement,” said James Carville, a Democratic strategist based in Louisiana.
If Cassidy loses, it would mark the first time a sitting Republican senator has been ousted by a Trump-endorsed challenger. The general election in this deep-red state is all but certain to go Republican, but the primary will draw national attention to the party’s internal divisions.
“I’m not going to be bullied,” Cassidy told reporters. “I’ll let the voters decide.” Early voting turnout has been moderate, with both campaigns expecting a surge on Saturday.