Jupiter police have arrested the 18-year old son of former U.S. Rep. Tom Rooney after they said he spray-painted “B.L.M.” on the sign at Trump National Golf Club.

“B.L.M” is abbreviation for the “Black Lives Matter” movement.

Thomas Joseph J. Rooney was booked into the county jail early Tuesday. According to the arrest report, Rooney told Jupiter police he did it “because of unequal treatment in the justice system.”

He faces one misdemeanor count of criminal mischief causing property damage of $200 or less, according to court records.

Rooney is scheduled to appear in Palm Beach County court for a July 29 arraignment.