What Minneapolis Police Lt. Bob Kroll said in Sunday radio interview Kroll said that once he's retired he'll go "radio silent." Author: CBS This Morning A week after announcing plans to retire from his position as president of the Minneapolis Police Federation, Minneapolis Police Department Lt. Bob Kroll was a guest on WCCO Radio Sunday morning. Kroll was interviewed by Roshini Rajkumar, who acknowledged that she is friends with Kroll but the interview was fair, balanced and Kroll was not allowed to see questions before the interview took place. Asked about speculation that he was in Washington, D.C. when President Trump supporters stormed the U.S. Capitol, Kroll denied being there.