Donald Trump has backed Ken Paxton for Texas Senate, intensifying a Republican battle. This move alarms party leaders who fear Paxton's controversies could jeopardize the seat. The endorsement highlights Trump's sway over the GOP. Democrats see an opportunity as Republicans grapple with internal conflict and potential resource drain. The race is now a key test of Trump's influence.

Unusually for a race of this size, Paxton allies are pointing the finger at a single donor: Leonard Leo, the conservative powerbroker.

Sen. John Cornyn does not believe President Donald Trump will make an endorsement in his competitive primary runoff against Ken Paxton.

Republicans are worried they’ll lose the Senate after Trump backed Ken Paxton.

Donald Trump will announce who he is backing in the Texas Senate race, which features Sen. John Cornyn and state Attorney General Ken Paxton.