In Portland, Oregon, federal agents have been using violent force against protesters. Some protesters have been arrested by officers in unmarked vehicles. Governor Kate Brown has asked the Department of Homeland Security to step aside, while President Trump threatened to dispatch federal officers to more cities.NPR's Mara Liasson reports Trump was hoping to campaign on a thriving economy and a swift end to the pandemic. Surging cases have forced him to change his message — and given Joe Biden an opening. Ongoing coverage of the Portland protests and police response from our colleagues at Oregon Public Broadcasting.Find and support your local public radio station.Email us at considerthis@npr.org.