In his first public comments since the announced departure of three city agency bosses, Johnson said, "there might be more people who plan on retiring."

Johnson and three other big-city mayors, all Democrats, will attend the March 5 hearing of the House Oversight and Government Reform Committee, which is investigating how local policies affect enforcement of President Donald Trump’s promise of mass deportations.

Mayor Brandon Johnson is preparing for his upcoming showdown with a congressional committee investigating sanctuary cities. He is also counting on state help to deal with some pressing needs in Chicago.