MADISON, Wis. (AP) — The former owner of a dinosaur-themed gas station chain in northeastern Wisconsin announced a run for Congress in a heavily Republican district on Monday after receiving an endorsement from former President Donald Trump over the weekend.

Tony Wied, who owned six Dino Stop gas stations and convenience stores, joined the race for the open 8th Congressional District seat caused by the surprise early retirement of Rep. Mike Gallagher. Two other Republicans and one Democrat have already announced their candidacies.

The primary is Aug. 13.

Wied attended Trump’s rally in Green Bay last week. The Milwaukee Journal Sentinel obtained a photograph of a document titled “Tony Wied for Congress — WI08” that included biographical information about Wied.

Trump on Sunday posted his endorsement of Wied on social media, even though he had yet to officially enter the race. Wied announced his campaign at an event Monday night in Green Bay, saying he was “humbled and honored” by the endorsement.