FARGO, N.D. (AP) — President Donald Trump is coming to North Dakota's largest city to hold another campaign rally for Republican U.S. Senate candidate Kevin Cramer.

Cramer, the state's lone representative to the U.S. House, is challenging Sen. Heidi Heitkamp, one of the most vulnerable Democrats seeking re-election. Trump won North Dakota by a large margin in 2016.

Cramer says the event is scheduled for Sept. 7. No other details were released.

Cramer was an early Trump supporter and remains one of the president's staunchest allies in Congress.

It will be Trump's third trip to North Dakota. He last came to the state in June to campaign for Cramer at a Fargo hockey arena.