James von Brunn, 89, making his first court appearance since the June 10 shooting of security guard Stephen Johns, told U.S. District Judge Reggie Walton he didn't want an evaluation and demanded a quick trial, CNN reported.
"Your constitution guarantees me a speedy and fair trial," von Brunn said. "I'm a United States citizen, and as a U.S. Naval officer, I swore to protect my country. I take my vows seriously."
Von Brunn's arraignment on murder charges was delayed until the evaluation can be completed, the U.S. broadcaster said.
Authorities say von Brunn, an avowed white supremacist, opened fire at the Washington museum in the June incident, killing Johns before being wounded when other guards returned fire.
2014: The Year in Music [PHOTOS]