The City of Chicago and the Chicago Transit Authority have launched a “Know Your Rights” ad campaign in response to President Donald Trump’s threat of mass deportations.

As a progressive freshman mayor, Johnson’s challenge now is to stand up for Chicago’s large immigrant community while also navigating the risks of antagonizing Trump.

In the face of a Trump administration directive to investigate state and local officials who don’t toe the line on the president’s orders on immigration, Gov. J.B. Pritzker and Chicago Mayor Brandon ...