Key Facts

• Trump endorsed Ken Paxton in the Texas Republican Senate runoff on Tuesday.
• Early voting for the runoff began a day before Trump's endorsement.
• Senate Republicans had spent months asking Trump to back Senator John Cornyn instead of Paxton.
• Trump had said after the March 3 primary that he would endorse one candidate and the other should quit, but no endorsement was made then.
• Trump faced pressure from his supporters who opposed endorsing Cornyn.
• Senate Majority Leader John Thune and related PACs spent tens of millions of dollars supporting Cornyn.
• Cornyn won the most votes in the primary but did not get over 50%, leading to the runoff.
• The winner of the runoff will run against Democrat James Talarico, who is ahead in recent polls and fundraising.
• The Texas Senate race is considered likely to be won by the Republican candidate.
• Early voting ends on Friday; Election Day is May 26.