Secret Service agents say 32-year-old Gregory Dale Brockman also threatened first lady Michelle Obama and former President George W. Bush.
Brockman pleaded not guilty to the charges Thursday before a federal magistrate in Philadelphia. His public defender, Mara Meehan, declined to comment.
Prosecutors say Brockman told Secret Service agents that his anger stems from the U.S. involvement in Iraq. The agents say he also admired cannibal Jeffrey Dahmer and other serial killers, and vowed to act on his threats if released.
Brockman, formerly of Lehighton, is serving 30 months for burglary and other crimes.