President Trump has endorsed Sen. Luther Strange in Alabama's special election.

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

Former Alabama Chief Justice Roy Moore is leading the runoff for the Republican nomination with 30 percent, according to a Monday poll.

Senator Luther Strange has done a great job representing the people of the Great State of Alabama. He has my complete and total endorsement! — Donald J. Trump (@realDonaldTrump) August 9, 2017

Republican Rep. Mo Brooks is also running against Strange, who took Jeff Sessions' seat after he became attorney general. The poll showed Strange and Brooks in a statistical tie with about 20 percent each.

The primary is Aug. 15, with a runoff scheduled for Sept. 26. The special election is on Dec. 12.

Moore and Strange have expressed support for Trump, while Brooks has been critical of the president.

Brooks has been endorsed by Fox News host Sean Hannity, conservative political commentator Laura Ingraham, and the Tea Party Patriots. Meanwhile, actor Chuck Norris has endorsed Moore.