WASHINGTON — An Idaho man accused of firing shots at the White House pleaded not guilty Tuesday to charges that he tried to assassinate President Barack Obama.

A lawyer for Oscar Ramiro Ortega-Hernandez entered the plea on his client's behalf during a brief appearance in U.S. District Court in Washington. Ortega did not say anything during the proceedings and will remain held without bond. He has another court date next month.

Prosecutors say Ortega used an assault rifle with an attached scope to fire a series of shots at the White House from long range on the night of Nov. 11.