(Portland, OR)  --  A demonstrator is suing the city of Portland over police officers' use of force at an August protest downtown.  Tracy Molina tells KATU News she's notified the city of her intent to file a lawsuit in connection to the August 4th counter-protest to a Patriot Prayer rally along the Southwest Waterfront.  Video footage shows police trying to grab Molina's protest sign before shoving her to the ground and then arresting her on charges of attempting to assault a police officer, disorderly conduct and interfering with an officer.  Molina is fighting the charges.  The Portland Police Bureau faced criticism for injuring several protesters at the event with aerial distraction devices.  The bureau responded by temporarily suspending its riot control methods pending an internal review of police use of force.