DICKINSON, N.D. (AP) — North Dakota Republican state Sen. Kelly Armstrong is running for the congressional seat currently held by Rep. Kevin Cramer.

Armstrong plans to officially launch his campaign Thursday with a rally in his hometown of Dickinson. Then Armstrong will travel to Bismarck for a rally before ending the day in Fargo.

He'll face Tiffany Abentroth and Sen. Tom Campbell in the Republican primary. Ben Hanson is running as a Democrat.

Cramer is running for the U.S. Senate seat held by Democrat Heidi Heitkamp.

Armstrong, an attorney, has strong ties to North Dakota's oil industry. His father, Mike, is a longtime oil driller, who has been a competitor, colleague and bird-hunting buddy for decades with billionaire Harold Hamm, considered the godfather of North Dakota's oil industry.