A federal judge plans to hear arguments and testimony on whether an Ohio man charged with plotting to attack the U.S. Capitol in support of the Islamic State group is competent to stand trial.

U.S. District Judge Sandra Beckwith earlier ordered a mental evaluation of 22-year-old Christopher Lee Cornell after his attorneys raised questions about his mental state. Reports have been filed under seal.

Defense attorney Martin Pinales (pi-NEL'-uhs) says Monday's hearing will be "an important factor in getting this case resolved."

There's no trial date for Cornell, who has been held without bond since his January 2015 arrest near Cincinnati. He has pleaded not guilty to four charges, including attempted murder of U.S. officials and employees. His father has said he was misled and coerced by "a snitch."