Portland Mayor Keith Wilson (D) told U.S. Immigration and Customs Enforcement to leave the city after tear gas was used on protesters.

"Today, federal forces deployed heavy waves of chemical munitions, impacting a peaceful daytime protest where the vast majority of those present violated no laws, made no threat, and posed no danger to federal forces," Wilson said in a statement on Saturday.

"To those who continue to work for ICE: Resign. To those who control this facility: Leave. Through your use of violence and the trampling of the Constitution, you have lost all legitimacy and replaced it with shame. To those who continue to make these sickening decisions, go home, look in a mirror, and ask yourselves why you have gassed children. Ask yourselves why you continue to work for an agency responsible for murders on American streets. No one is forcing you to lie to yourself, even as your bosses continue to lie to the American people."

He explained that the city "is moving swiftly to operationalize an ordinance that went into effect this month, imposing a fee on detention facilities that use chemical agents. As we prepare to put that law into action, we are also documenting today's events and preserving evidence. The federal government must, and will, be held accountable."

On Saturday, thousands of protesters arrived at an ICE facility in Portland, where federal agents used tear gas, pepper balls, rubber bullets, and flash-bang grenades against the crowd, The Oregonian reported.

The protesters came from a union-organized march, which included an earlier rally, called “Labor Against ICE,” where members from at least 30 unions joined, OPB reported.