A man charged with attempting to assassinate President Donald Trump in South Florida last year was back in court this week, asking a federal judge to let him represent himself, as prosecutors tried to block him from introducing irrelevant evidence during trial.

Ryan Routh’s court-appointed federal public defenders on Thursday asked to be taken off the case, saying he had refused repeated attempts to meet with their team.

Separately, prosecutors trying the case asked a judge ahead of the September trial to rule out the introduction of inadmissible evidence, such as Routh’s previous writings, that may unfairly influence jurors. The judge was planning to hear arguments over that matter on Friday.

Here’s what to know about the case.

The judge lets Ryan Routh represent himself