Would-be Trump assassin Ryan Wesley Routh appeared briefly in federal court in West Palm Beach on Monday, where he was charged with possessing a firearm despite being a convicted felon and possessing a firearm with an obliterated serial number.

Ryan Wesley Routh, 58, was seen wearing dark blue prison scrubs with his hands and feet shackled ahead of his court appearance.

Additional charges may be filed against him as the investigation continues and prosecutors seek an indictment.

A detention hearing for Routh has been set for Sept. 23 while his arraignment will be Sept. 30.

Routh got within 300 to 500 yards of Trump at a chain link fence on the edge of his Palm Beach golf course Sunday afternoon while armed with an AK-style assault rifle, authorities say.