MINNEAPOLIS (AP) — Days of demonstrations against immigration agents and a new lawsuit have left Minnesota tense. Federal authorities used tear gas on Monday to break up crowds of whistle-blowing activists. The state, joined by Minneapolis and St. Paul, sued the Trump administration Monday to try to halt or limit the enforcement surge that led to the fatal shooting of a Minneapolis woman. The Department of Homeland Security has pledged to send more than 2,000 immigration officers into Minnesota in what Immigration and Customs Enforcement has called its largest enforcement operation ever. Homeland Security says it has made more than 2,000 arrests in the state since December.