Mayor Brandon Johnson is addressing federal immigration enforcement efforts in Chicago. Brandon Johnson and other mayors of sanctuary cities are called to testify before congress.

On Monday, Mayor Brandon Johnson received a letter from Washington, D.C., that states, in summary, that Chicago and other cities like it — notably Denver, New York and Boston, all of which hold sanctuary city status like Chicago — are being investigated by the U.S. House Committee on Oversight and Government Reform.

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.

The City of Chicago is being investigated for its "sanctuary city" status, as immigration officers continue to make arrests in the city and around the U.S. On Monday, Mayor Brandon Johnson received a letter from Washington,