A man accused of trying to assassinate President Trump at one of his Florida golf courses last year is scheduled to go to trial on Monday, a rare scenario made all the more unusual because the man intends to defend himself in court.

The trial comes nearly a year after the man, Ryan W. Routh, was arrested and charged with planning to shoot at Mr. Trump from just outside the Trump International Golf Club West Palm Beach.

On Sept. 15, 2024, a Secret Service agent fired at a man, later identified as Mr. Routh, after seeing his face and the barrel of a semiautomatic rifle on the fence near the sixth hole while Mr. Trump was golfing nearby. It was the second apparent assassination attempt against Mr. Trump last year as he was running for a second term.

Mr. Routh, a 59-year-old itinerant building contractor from North Carolina, has pleaded not guilty to charges of trying to assassinate a major presidential candidate, assaulting a federal officer and several firearm violations. The attempted assassination charge carries a maximum penalty of life in prison.

The trial will take place at the Federal District Court in Fort Pierce, Fla., about 65 miles north of the golf course, before Judge Aileen M. Cannon. She presided in 2023 over the federal prosecution of Mr. Trump involving the mishandling of classified documents before dismissing the case last summer.

Jury selection in Mr. Routh’s trial is expected to take up to three days of the trial, which could last as long as four weeks.