The man charged in connection with an apparent assassination attempt against Donald Trump in Florida this month dropped off a box at a person’s home that included a letter that declared, “This was an assassination attempt,” a court document revealed Monday.

The note came to light in a U.S. District Court filing asking that Ryan Wesley Routh, 58, be held in pre-trial detention. 

Law enforcement was contacted by a civilian on Sept. 18 who said that Routh had dropped off a box at his residence several months earlier, the filing said. The witness opened the box after learning of the Sept. 15 incident at Trump International Golf Club in West Palm Beach, Florida. 

In that box was ammunition, four phones and various letters. 

One handwritten letter addressed to “The World” said: “This was an assassination attempt on Donald Trump but I failed you.”

The letter said in part: “He ended relations with Iran like a child and now the Middle East has unraveled.” 

Routh was arrested on Sept. 15 after a Secret Service agent moving ahead of Trump as he was golfing at Trump International spotted “the partially obscured face of a man” in the brush along the fence line and the barrel of a rifle “aimed directly at him.” The agent fired at Routh, who fled. He was spotted by a witness and was soon after arrested on Interstate 95.

Routh has since been charged with possession of a firearm by a convicted felon and possession of a firearm with an obliterated serial number. He is due in court Monday. 

The FBI searched Routh’s Nissan Xterra and found six cellphones — one of which contained a Google search of how to travel from Palm Beach County to Mexico.

Cell site records from two of the phones revealed Routh had traveled from Greensboro, North Carolina, to West Palm Beach on Aug. 14, 2024.

Further, on “multiple days and times from Aug. 18, 2024, to Sept. 15, 2024, Routh’s cellphone accessed cell towers located near Trump International and the former president’s residence at Mar-a-Lago,” the filing said.

Also found in the vehicle were 12 pairs of gloves, a Hawaii driver’s license in Routh’s name, his passport and documents. One of the documents was a handwritten list of dates in August, September and October and venues where Trump had appeared or was expected to. 

Agents also found a notebook with “dozens of pages” filled with names and phone numbers about Ukraine, discussions on how to join the fight on behalf of Ukraine and notes criticizing the Chinese and Russian governments.

The filing said law enforcement learned that the license plate on the Nissan Xterra was not registered to the vehicle, and two additional license plates were found in the car. 

A search of the area where Routh had been hiding near the golf course led to the discovery of a rifle with a scope attached and obliterated serial number, an extended magazine and a backpack and reusable shopping bag that both contained plates “capable of stopping small arms fire.”

On the rifle, investigators found a latent fingerprint on a piece of tape attached to the firearm that preliminarily matched Routh. 

This is a developing story, check back here for updates soon