Louisiana Republican Sen. Bill Cassidy wanted his reelection campaign to be about the “present and the future.” President Donald Trump had other plans.

Five years after Cassidy voted to convict Trump in his second impeachment, the senator lost his primary for reelection to a Trump-endorsed challenger – and a second challenger who also embraced Trump. Trump-backed Rep. Julia Letlow and Louisiana State Treasurer John Fleming are now headed to a runoff.

Cassidy became the first GOP senator to lose renomination in close to a decade, a remarkable downfall that shows again how Trump dominates the party.

Cassidy signaled in his concession speech, without mentioning Trump, that he could spend the final months of his term being more of a thorn in Trump’s side – or at least more openly critical of his party.

“Let me just set the record straight: Our country is not about one individual. It is about the welfare of all Americans and it is about our Constitution,” Cassidy said. “And if someone doesn’t understand that and attempts to control others through using the levers of power, they’re about serving themselves. They’re not about serving us. And that person is not qualified to be a leader.”