Heller drew Trump’s ire for his initial opposition to the Republican health care bill in the Senate last year before eventually voting for it. Trump joked at a White House luncheon with Heller seated next to him “he wants to remain a senator, doesn’t he?”

Inside Elections with Nathan L. Gonzales rates Heller’s race Toss-up.

The president will also campaign for Rep. Kevin Cramer on June 27 in his race against Democratic Sen. Heidi Heitkamp. This comes amid tension between Cramer and Trump, with Cramer saying that Trump encouraged him to run for Senate but seemed to say good things only about Heitkamp.

“He’s coming to Fargo on the 27th to support me,” Cramer told The Forum News Service in an email.

Trump last visited North Dakota in September to bolster support for the GOP tax reform bill, and in seeking Heitkamp’s vote for the plan he called her “a good woman.” Heitkamp has been one of the few Democrats in recent times to vote across party lines, and some Republicans say the president has been too soft on her.