Sen. Bill Cassidy became the latest Republican incumbent to lose his seat after crossing President Donald Trump, finishing third in Louisiana’s jungle primary Saturday night as Trump’s endorsed challenger advanced to a runoff. The defeat marks Trump’s most significant scalp yet in what political observers are calling a methodical campaign to reshape Congress ahead of the 2026 midterms.
Cassidy, who voted to convict Trump during the second impeachment trial in 2021, managed just 18% of the vote in the all-party primary. Trump-backed state Treasurer John Fleming will face Democratic Rep. Cleo Fields in the general election after Fleming captured 31% and Fields took 28%. The outcome ends Cassidy’s 17-year tenure on Capitol Hill and sends an unmistakable message to Republicans considering independence from the president.
The Louisiana result follows Trump’s successful effort to oust Indiana Rep. Victoria Spartz in last week’s primary. Spartz, who had criticized Trump’s approach to Ukraine aid, lost by 12 points to a challenger who made loyalty to the president the centerpiece of his campaign. Trump held a rally for the winner two days before the election.
Rep. Thomas Massie of Kentucky now finds himself squarely in Trump’s crosshairs. The libertarian-leaning congressman has clashed with Trump on government spending and executive power. Trump has openly mused about backing a primary challenger, and Kentucky Republican operatives report multiple potential candidates have reached out to the White House about seeking the president’s endorsement.
Massie represents a solidly Republican district in northern Kentucky, but Trump carried it by 40 points in 2024. Political handicappers consider any Trump-endorsed challenger an immediate favorite, particularly after Cassidy’s collapse despite his institutional advantages and fundraising network.
The pattern emerging from Trump’s intervention reveals a narrow but decisive focus. He’s not targeting every critic — senators who opposed him on single votes or procedural matters have been spared. Instead, Trump appears to be systematically removing Republicans who voted for impeachment, criticized him repeatedly in public, or positioned themselves as leaders of an anti-Trump faction within the party.
For Republican incumbents, the calculus is stark. Cassidy outspent Fleming nearly three-to-one and had the backing of Louisiana’s business establishment. None of it mattered against Trump’s endorsement in a Republican-leaning electorate. Senate and House members up for reelection in 2026 are watching closely. The question isn’t whether Trump has power — Louisiana and Indiana answered that. The question is how far he’ll take it.
Key Points
- Sen. Bill Cassidy lost Louisiana’s primary despite 17 years in Congress and a 3-to-1 fundraising advantage over Trump’s pick
- Trump has now successfully ousted three Republican incumbents who opposed him, including Indiana Rep. Victoria Spartz last week
- Rep. Thomas Massie of Kentucky is next in line as Trump signals willingness to challenge any Republican who bucked his leadership
https://www.washingtonexaminer.com/news/campaigns/congressional/4571847/trump-revenge-tour-massie-kentucky-primary/ – May 17, 2026
