Routh was initially brought into the courtroom through a door to the right of the judge’s bench at just before 10am with three other defendants.
Minutes later, Routh, who was shackled, was removed. He re-entered the court at 10.35am and spoke intently with his lawyer, federal public defender Kristy Militello, as they reviewed court documents
His was the sixth and final case heard before Mr McCabe on Monday morning. He was sworn in at just after 10.46am, and the judge unsealed the criminal complaint.
Prosecutor Adam Craig McMichael argued that Routh should be detained ahead of his trial because he was a flight risk and posed a danger to the community.
Asked about his financial standing, Routh said his youngest son was a dependant. He said he had a job but requires “occasional support”.
When asked whether he had other possessions with value, such as jewellery, he replied: “No, nothing”. Court was adjourned at 10.55am, and Routh was escorted out.
Officials alleged on Monday that Routh had hidden in bushes surrounding Trump’s golf course in West Palm Beach and pointed a gun with a scope at Trump, who was around 400 yards away.
It was the second apparent assassination attempt targeting Trump in three months. On July 13, a bullet grazed the former president’s ear when gunman Thomas Crooks fired a volley of bullets while he spoke at a rally in Butler, Pennsylvania.