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 has decided to testify before a congressional committee next month after being asked to explain the city’s policies limiting cooperation with federal immigration

In recent years, the City of Denver has served more than 40,000 migrants. Now, Mayor Mike Johnston is being asked to testify in a hearing on immigration and so-called "sanctuary jurisdictions."