CHICAGO—Three undercover law enforcement officers were shot and wounded Wednesday morning while driving onto an expressway on Chicago’s South Side, police said. The shooting occurred at 5:50 a.m. near the 22nd District police station in the city’s Morgan Park neighborhood. The three were in an unmarked undercover vehicle on their way to an assignment when they were shot, Chicago police Superintendent David Brown told reporters. Two of the officers are agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives, and one is a Chicago officer, Brown said. Their injuries were not considered life-threatening. No arrests have been reported. The shooting comes the same day as a scheduled visit to suburban Crystal Lake, Illinois, by President Joe Biden. Chicago Mayor Lori Lightfoot has said she plans to discuss gun control and the city’s violence, which has included an increase in shootings this year, when she meets with the president. …