Workers set up concrete barriers and put other security measures in place as police and protesters alike geared up for President Donald Trump's visit to Great Falls on Thursday.

Cascade County officials are expecting long lines and people to arrive early Thursday to wait outside the Four Seasons Arena at ExpoPark, where the Montana State Fair is held each year.

Officials plan to unlock the gates at 10:30 a.m. Thursday, though the arena doors won't open until 1 p.m. There will be benches, food and nonalcoholic drinks available for those early arrivals standing in line on a day that is forecast to reach 90 degrees, officials said.

Trump is scheduled to speak at 4 p.m.

At least one group is organizing an anti-Trump rally to be held outside the 6,600-seat arena while the president is inside to campaign for Republican U.S. Senate candidate Matt Rosendale against incumbent Democrat Jon Tester.

The vast majority of attendees are expected to be Trump supporters in a state that chose him over Democrat Hillary Clinton by 20 percentage points in the 2016 presidential elections.

A statement by Trump's re-election campaign said the president plans to speak about tax cuts, illegal immigration and other issues. Trump, who vowed that Tester would pay politically for his role in the derailment of his first Veterans' Affairs nominee, Ronny Jackson, is also expected to promote Rosendale's Senate campaign.