Mayor Brandon Johnson will testify before Congress next month as part of a Republican-led House probe into sanctuary cities, his office announced Wednesday.

House Oversight Committee Chairman James Comer (R-KY) sent letters Johnson and the mayors for three other major cities – Boston, Denver, and New York – last week, asking them to testify before the committee and hand over all documents and communications related to their city's sanctuary policies.

The U.S. Department of Justice is suing the State of Illinois and the City of Chicago, alleging that sanctuary status is obstructing federal immigration enforcement. Charlie De Mar reports.