Rep. Julia Letlow (R-La.) announced Tuesday that she is launching a Republican primary challenge against Sen. Bill Cassidy (R-La.), stepping into the race just days after President Trump publicly encouraged her to pursue a Senate run in Louisiana.

In a two-minute launch ad, Letlow framed her campaign as part of a broader fight to defend conservative priorities in Washington.

“I have fought alongside President Trump to put America first, standing up for our parents, securing our borders, supporting law enforcement, rooting out waste, fraud and abuse that drives up inflation and fighting to fix an education system too focused on woke ideology instead of teaching,” she said.

Letlow argued that Louisiana Republicans want a senator whose votes are predictable when the stakes are highest.

“A state as conservative as ours, we shouldn’t have to wonder how our senator will vote when the pressure’s on,” she continued, without mentioning Cassidy by name. “Louisiana deserves conservative champions, leaders who will not flinch.”

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Cassidy responds after call from Letlow

Cassidy confirmed the news on X, saying Letlow personally called him earlier Tuesday to share her decision to run.

“She said she respected me and that I had done a good job. I will continue to do a good job when I win re-election,” Cassidy wrote. “I am a conservative who wakes up every morning thinking about how to make Louisiana and the United States a better place to live.”

Cassidy has long presented himself as a policy-focused Republican, emphasizing issues such as fiscal restraint, energy development, and hurricane recovery, while also working within the Senate’s institutional framework—an approach that can play well with establishment GOP voters but has faced skepticism from grassroots conservatives in recent years.

Trump signals support for Letlow

Letlow’s announcement followed Trump’s recent public praise of the congresswoman, where he encouraged her to make the jump to the Senate. In a Truth Social post, Trump described Letlow as a “TOTAL WINNER!” and said she “has ALWAYS delivered for Louisiana.”

That backing immediately reshaped the race, positioning Letlow as the most prominent Republican challenger Cassidy has faced as he seeks another term. In a state where Trump remains highly popular among Republican primary voters, his involvement is likely to be one of the biggest factors in determining the outcome.

A political fight years in the making

Cassidy has been under heavy pressure from many pro-Trump activists since 2021, when he became one of seven Republican senators to vote to convict Trump during his impeachment trial following the Jan. 6, 2021, Capitol riot. The Senate ultimately acquitted Trump, but the vote left lasting consequences for Cassidy inside Louisiana GOP politics.

What Letlow is betting on

Letlow, who has represented Louisiana’s 5th Congressional District since 2021, rose to national attention after winning a special election following the death of her husband, Rep. Luke Letlow, who died from complications related to COVID-19 shortly after being elected.

Since entering Congress, she has worked to build relationships within the Republican conference while maintaining a strong conservative profile—supporting border enforcement policies, opposing Democratic-backed spending packages, and highlighting cultural issues such as parental rights and education.

Her campaign’s early tone signals she plans to run as a Trump-aligned conservative focused on the top issues driving Republican voters in 2025: immigration, inflation, crime, cultural pushback in schools, and government accountability.

New primary rules could raise the stakes

The race will also unfold under Louisiana’s new closed primary process, a change that could have major consequences. With a more Republican-only electorate participating, Cassidy may face an even more conservative and Trump-friendly primary environment than in previous cycles.

That shift could make it harder for Cassidy to rely on crossover voters or independents who might otherwise support an incumbent known for policy work and institutional seniority.

At the same time, a crowded field could still complicate the race. If multiple Republicans enter the primary and divide anti-Cassidy voters, Cassidy could benefit from winning a strong plurality of establishment conservatives, business-oriented Republicans, and voters who prioritize seniority and committee influence.

A high-profile Louisiana showdown

With Letlow officially in the race and Trump already signaling his preference, Louisiana is shaping up to host one of the GOP’s most-watched Senate primaries this cycle. The contest will likely test whether Republican voters prioritize seniority and governing experience—or whether they want a more confrontational, Trump-aligned fighter in the Senate.

For now, both candidates are claiming the conservative mantle. Letlow is promising a senator who will “not flinch,” while Cassidy insists he remains “a conservative” focused on improving life in Louisiana—and says he expects to win.

“She said she respected me and that I had done a good job,” Cassidy wrote. “I will continue to do a good job when I win re-election.”