The Democratic mayors of Denver, Chicago, Boston, and New York City were grilled for hours over their so-called sanctuary city policies at a Congressional hearing Wednesday as President Donald Trump pushes his aggressive immigration agenda and threatens to punish cities that don’t comply.

Democratic mayors from four major U.S. cities defended their "sanctuary city" policies on Capitol Hill on Wednesday. House Republicans have criticized these policies, which limit local law enforcement from cooperating with immigration agents,

Johnson is appearing before the Committee on Oversight and Government Reform to defend the city’s law that, in part, restricts police from detaining people solely based on their immigration status.