Voters in Texas have sent another warning to Republicans that they may be facing fierce political headwinds in a critical election year.

A special election for a state Senate seat on Saturday saw the Democratic candidate, union leader Taylor Rehmet, win by a 14-point margin. But that doesn't tell the full story.

Rehmet defeated a Trump-backed candidate in a district the president won by a 58-41 margin in 2024. It means the result represents a huge 31-point swing towards the Democrats from that presidential election.

The major upset is likely to unnerve Republicans ahead of November's midterm elections. Dan Patrick, the Republican Lieutenant Governor of Texas, said it was a "wake-up call".

"Our voters cannot take anything for granted," he said.