Sen. John Cornyn (R-TX) refused rival Ken Paxton‘s offer to cease running negative ads, with an ominous message attached.

On Thursday, Paxton extended an olive branch to Cornyn after the two spent over a year waging a bitter primary campaign against one another. After securing President Donald Trump‘s endorsement, Paxton sought to end the race on a positive note, boosting a call from the head of the Texas Republican Party to end attack ads against other Republicans.