An initial evaluation found that Oscar Ramiro Ortega-Hernandez is competent to stand trial, but prosecutors filed a motion Monday asking for further tests.
A judge granted a defense request to delay Ortega's preliminary hearing until the motion is argued. Ortega is due back in court Dec. 12.
Authorities say Ortega used an assault rifle to fire up to 9 shots at the White House from his vehicle on the evening of Nov. 11, when Obama was out of town. Court documents allege the Idaho Falls, Idaho native has referred to Obama as the Antichrist.