The police department in Wasilla, Alaska, told CBS that they encountered Track Palin after responding to a residence for a report of a disturbance at about 10 p.m.
According to court documents, Track Palin punched his girlfriend in the eye, kicked her and then threatened to shoot himself in the head with an AR-15 assault rifle.
"An investigation revealed Track Palin had committed a domestic violence assault on a female, interfered with her ability to report a crime of domestic violence, and possessed a firearm while intoxicated," police told CBS in a statement.
He was held without bail and was expected to be arraigned Tuesday. CBS reported that Track Palin was charged with three misdemeanor counts for assault, allegedly possessing the gun while intoxicated, and for interfering with a domestic violence report.