The investigation is ongoing, so additional charges may be filed.
Trump was playing a round of golf and was about 300 to 500 yards behind, authorities said.
There also was a black plastic bag containing food.
A van carrying Ryan Wesley Routh at federal courthouseJoe Raedle/Getty Images
In March, 2010, he was convicted in North Carolina of multiple counts of possession of stolen goods.
Trump was unharmed in the incident.
He survived an assassination attempt in July, when an assailant fired shots into a rally in Pennsylvania.
One attendee was killed.
The assailant also was shot and killed.
