President Donald Trump endorsed Alabama Sen. Luther Strange in a tweet Tuesday night ahead of the state’s Aug. 15 GOP Senate primary.

"Senator Luther Strange has done a great job representing the people of the Great State of Alabama. He has my complete and total endorsement!," Trump tweeted.

Earlier in the day Trump himself called Strange to notify him of the endorsement, according to a Republican with knowledge of the call. .

The endorsement is a coup for Strange and a blow to his competitors in the Republican primary for the special election for Attorney General Jeff Sessions’ Senate seat. Trump is highly popular in Alabama and his endorsement and the near dozen candidates competing for the nomination in the primary had been jockeying to closely associate with the president.

Strange faces a crowded primary that includes other prominent Republicans including Rep. Mo Brooks and former Alabama Supreme Court Chief Justice Roy Moore.