Mayor Johnson was asked​ by the House Oversight Committee to testify on Capitol Hill next month about Chicago's sanctuary city status — along with other big city mayors.

Mayor Brandon Johnson says he has not decided whether to testify before Congress over the city's sanctuary city policies. Why it matters: If the mayor testifies, he will attempt to fend off federal pressure while supporting the city's immigration policy that has stood for 40 years.

If Mayor Brandon Johnson refuses to appear as requested, it could open a new front in the ongoing battle with the GOP-controlled U.S House and the Trump administration, which is attempting to strip self-proclaimed sanctuary cities of all federal funding.