Ryan Routh pleaded not guilty in federal court on Monday to five charges related to his alleged assassination attempt on former President Donald Trump on a golf course in Florida this month.

Routh appeared at a courthouse in West Palm Beach with his public defense counsel to enter the plea during his arraignment, according to his court docket. He was charged last week with attempting to assassinate a major presidential candidate and numerous firearm offenses.

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Authorities say Routh staked out on the perimeter of Trump International Golf Club on Sept. 15 with a loaded semiautomatic rifle while Trump was golfing. A Secret Service agent spotted Routh pointing his gun through the brush at the agent, and the agent began firing at Routh, causing the defendant to dart away before he ever got a line of sight to Trump, according to authorities.

Routh was arrested on the highway less than an hour later, and he has been detained ever since. A judge ordered Routh last week to remain behind bars without bail until his trial.

This story is developing.