Lawrence: How does a TX police chief go AWOL?

Tonight on the Last Word: Uvalde School District Police Chief Pete Arredondo is sworn in to his elected seat on the City Council. Also, the Uvalde shooting renews the debate over gun safety policy. Plus, Peter Navarro’s subpoena may indicate an expansion of the Justice Department’s January 6 investigation. And a GOP-appointed federal judge criticizes the lack of a Supreme Court code of ethics. Tony Plohetski, Guillermo Contreras, William Hogeland, Rep. Eric Swalwell and Emily Bazelon join Lawrence O’Donnell.