Sept. 8 (UPI) -- Jury selection got underway Monday in the trial for Ryan Routh, over his alleged assassination attempt against President Donald Trump in September 2024.

Routh, now 59, entered a federal courthouse in Fort Pierce, Fla., for the start of his criminal trial in what's likely to be a three-day jury selection process.

He pleaded not guilty to charges of attempting to assassinate a major presidential candidate, assaulting a federal officer and multiple gun violations after he allegedly waited for then-candidate Trump nearly 12 hours around the perimeter of Trump's golf club in West Palm Beach on Sept. 15 before later caught by Martin County Sheriff's deputies.

In addition, Routh has pleaded not guilty to separate charges filed by the state on terrorism and attempted murder.

The trial is expected to last around a month and Routh will be representing himself during court processings.