Ryan Routh, the suspect who allegedly attempted to assassinate President Donald Trump at his West Palm Beach golf course made an appearance in federal court on Friday.

Routh was arrested on September 15 of last year. Judge Aileen Cannon is presiding over his trial, which is scheduled to begin in September.

According to CBS12, Routh's court-appointed defense team have argued in court that federal prosecutors are withholding key evidence. 

His defense wants to test fire the rifle Routh allegedly had in his possession on the day of his arrest, arguing that a long-shot likely would not have reached him. The prosecution is opposing to test firing the rifle.