President Donald Trump still appears undecided on whether he'll endorse incumbent Texas GOP John Cornyn or challenger Attorney General Ken Paxton in a runoff later this month for the GOP nomination for the General Election.

"Yeah, I'll make a decision. ...  Maybe relatively soon," he told a reporter Thursday.

The runoff is May 26. 

Paxton leads by 3.2 points, according to the RealClearPolitics polls average. And a Trump endorsement will be a significant factor in the outcome.