Mayor Brandon Johnson urged Chicagoans to “rise up in this moment” against President Donald Trump’s mass deportation effort, even as he acknowledged Wednesday that the deployment of the military to help carry out immigration raids in Los Angeles could happen here. Johnson refused to say precisely what he would do if mass demonstrations in Chicago — perhaps as soon as Saturday’s “No Kings Day of Defiance” protests — provoke an L.A.-style federal response. The mayor would only say that he is concerned enough to have spoken directly with Gov. JB Pritzker and Cook County Board President Toni Preckwinkle about the...