Julia Letlow is running for the United States Senate in Louisiana.
Evidence and Verdict
For
AP News reports Rep. Julia Letlow announced her candidacy and launched a primary bid against Sen. Bill Cassidy at a Baton Rouge event. CNN and USA Today coverage likewise describe Letlow launching a Senate primary campaign with public events and media reporting. AP also notes she filed candidate paperwork in Baton Rouge and framed Trump’s endorsement as support for a Senate run. FEC records and an FEC Statement of Organization PDF show committee filings and candidate records consistent with her running a federal campaign.
Against
An FEC filing referenced in the provided PDF still lists a committee name 'JULIA LETLOW FOR CONGRESS,' which could reflect residual House campaign organization rather than a newly named Senate committee. Some sources frame the reporting around an intra-party primary challenge (against Sen. Cassidy), so ongoing reporting and filings may change as the race progresses and she is not yet a general-election nominee.
Verdict
Multiple reputable news outlets report that Julia Letlow publicly announced and filed paperwork to challenge U.S. Sen. Bill Cassidy, and FEC records show candidate-related filings, so the claim that she is running for the U.S. Senate in Louisiana is supported.
Sources
Rep. Julia Letlow launches primary bid against Sen. Bill Cassidy
Rep. Julia Letlow launches primary bid against Sen. Bill Cassidy - Mar 22, 2026
Letlow announced her candidacy on Tuesday morning at a breakfast event in Baton Rouge.
Open sourceWith Trump's backing, Rep. Julia Letlow launches a primary ... - CNN
With Trump's backing, Rep. Julia Letlow launches a primary ... - CNN - Mar 22, 2026
### CNN values your feedback
Open sourceGovernor Landry makes endorsement in heated Louisiana Senate ...
Governor Landry makes endorsement in heated Louisiana Senate ... - Mar 22, 2026
# Trump, Landry loom large as Cassidy, Letlow clash in Louisiana Senate primary
Open sourceSen. Bill Cassidy downplays Trump backing GOP rival in reelection bid
Sen. Bill Cassidy downplays Trump backing GOP rival in reelection bid - Mar 22, 2026
Letlow, who also filed her candidate paperwork in Baton Rouge, said Trump’s endorsement was a reflection that “he needs someone he can depend on over in the Senate.”
Open sourceBill Cassidy faces another MAHA fight with his reelection on the line
Bill Cassidy faces another MAHA fight with his reelection on the line - Mar 22, 2026
## A MAHA attack line
Open sourceLouisiana U.S. Senate Election 2026: Latest Polls - ny times
Louisiana U.S. Senate Election 2026: Latest Polls - ny times - Mar 22, 2026
### U.S. Senate polls
Open source