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President Trump endorsed Texas Attorney General Ken Paxton in the Texas Republican U.S. Senate runoff on Tuesday, a day after the start of early voting.

Why it matters: Senate Republicans spent months pleading with Trump to endorse incumbent U.S. Sen. John Cornyn over Paxton.

Catch up quick: Trump had posted that an endorsement was coming after the March 3 primary and said whoever didn't get his endorsement should drop out. That endorsement didn't materialize at the time.