Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Portland Protest Groups Sue Over US Agents' Use of Tear Gas, Rubber Bullets Associated Press PORTLAND, OREGON - Two groups protesting U.S. agents sent to Portland by President Donald Trump to tamp down demonstrations outside a federal courthouse have sued the Department of Homeland Security, alleging it violated the Constitution by sending federal law enforcement to disperse crowds with tear gas and rubber bullets. The Wall of Moms -- a group of self-described mothers -- and the Don't Shoot Portland group filed the lawsuit late Monday against Acting Homeland Security Secretary Chad Wolf and other federal officials. The agency did not immediately respond Tuesday to a request for comment about the lawsuit. Members of the group of mothers have "been tear-gassed night after night, left vomiting and unable to eat or sleep because of the toxic poison blasted at them," the lawsuit said. It claimed the tactics are unlawful and said the presence of the agents in Portland violates "a foundational principle of American democracy" because the agents are essentially performing local police duties that are reserved for state and local authorities. .