Denver Mayor Mike Johnston on Wednesday agreed to testify before Congress over Denver's status as a sanctuary city. Why it matters: Johnson will be pressed to defend Denver's policies protecting migrants from deportation at a time when the U.

Denver Mayor Mike Johnston on Wednesday announced he would attend a congressional hearing for an investigation into so-called sanctuary cities.

Denver Mayor Mike Johnston has agreed to testify before Congress over the city’s immigration policies, his office said Wednesday. The Republican-led House Oversight Committee last month sent a letter to Democratic mayors of so-called sanctuary cities,