WATCH LIVE: Donald Trump speaks at campaign rally in Montana

President Donald Trump will speak in Montana tonight against Sen. Jon Tester (D-MT).

Trump attacked Tester as he boarded Air Force One Thursday afternoon.

"I'm going to Montana. We are going to do a rally for Matt Rosendale. He's a fantastic man and he's doing very well and we will be talking some pretty tough things about Senator Tester, who has been a disaster and a disaster, frankly, for Montana," Trump told reporters.

Tester has authored several bills this year, and 15 of them have been signed into law by the same president who claimed is a "disaster." Presumably, if Tester was such a disaster, Trump wouldn't have signed those 15 bills.

One major thing Montanans appreciate from their senator has been his work with veterans. The VA MISSION Act scrapped the Choice Program, cut out bureaucracy and gave a better healthcare experience to Montana veterans, the senator said.

"Montana veterans deserve more than a thank you - they deserve a health care system that works for them, whether it's at a VA clinic or a local community doctor," said Tester, Ranking Member of the Senate Veterans' Affairs Committee. "Our historic law gets rid of the government bureaucracy that has stood between Montana veterans and their health care."

The Trump rally will begin at 8:30 p.m. EST (6:30 p.m. local Montana time). Watch below: