An indictment adds firearms and "injury to a dwelling" charges to a list of 17 Oscar Ramiro Ortega-Hernandez was already facing. The maximum penalty for injury to a dwelling is 20 years in prison.
A status hearing for Ortega, a resident of Idaho Falls, Idaho, is scheduled for Friday.
Ortega is charged with using 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. Obama and the first lady were out of town.
