President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE endorsed Pennsylvania state Rep. Fred Keller (R) weeks before the special election in Pennsylvania’s 12th District.

“Fred Keller of the Great State of Pennsylvania has been an outstanding State Rep. Now he is running as the Republican Nominee for Congress, and has my Complete and Total Endorsement. Strong on Crime, Second Amendment, Military, Vets, and Healthcare. He will do a fantastic job!” Trump tweeted on Friday.

Fred Keller of the Great State of Pennsylvania has been an outstanding State Rep. Now he is running as the Republican Nominee for Congress, and has my Complete and Total Endorsement. Strong on Crime, Second Amendment, Military, Vets, and Healthcare. He will do a fantastic job! — Donald J. Trump (@realDonaldTrump) May 3, 2019

Keller is running against attorney Marc Friedenberg to replace former Rep. Tom Marino Thomas (Tom) Anthony MarinoWhy the North Carolina special election has national implications The Hill's Morning Report - Pelosi remains firm despite new impeachment push Republican wins special House election in Pennsylvania MORE (R), who resigned in January to take a job in the private sector.

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Gov. Tom Wolf (D) announced a day after Marino officially left Congress that the special election to replace Marino would be held on May 21.

Keller was chosen as his party’s nominee for the race in a convention in March.

Marino won reelection last year by 32 points against Friedenberg in the newly drawn 12th District after Pennsylvania redrew its congressional districts.

The 12th District covers much of the old 10th District, which Republicans had held since 2011 before the congressional map was redrawn.