A super PAC sanctioned by the White House is spending as much as $200,000 to support U.S. Sen. Luther Strange's get-out-the-vote effort in the final days before Tuesday's Republican primary.

Politico reported Friday that America First Action will spend between $150,000-$200,000 on digital advertising. The Associated Press has also reported on the funding.

That comes three days after President Trump tweeted an endorsement of Strange, who was appointed to the Senate in February by former Gov. Robert Bentley.

The Republican and Democratic primaries in the special election to fill the seat held by Jeff Sessions are Tuesday. A runoff is expected in the GOP race and possibly in the Democratic race as well, which would take place Sept. 26.

Former Alabama Chief Justice Roy Moore has consistently led in GOP primary polling while Strange has held a narrow lead over U.S. Rep. Mo Brooks.

"As the pro-Trump super PAC, we are proud to join the president in supporting the candidacy of Sen. Luther Strange, a tireless public servant and defender of the First and Second Amendment rights of his fellow Alabamians," Erin Montgomery, a spokeswoman for the super PAC, told Politico. "Sen. Strange has already proven himself to be the best possible candidate in this race to stand beside our president and make America great again."