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 decided to testify before a congressional committee next month after its members asked him to travel to Washington, D.C., to explain the city’s policies limiting cooperation with federal immigration authorities.

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."

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,

Former Democratic state lawmaker Penfield Tate agreed and suggested the hearing would allow Johnston to call out Congress for failing to pass immigration reform while highlighting how Denver has managed the fallout. The other side: "Those hearings are dog and pony shows," conservative columnist Krista Kafer said on "CIO."

The bipartisan U.S. House Committee on Oversight and Government Reform sent a letter to Denver Mayor Mike Johnston asking him to testify. Johnston didn't say if he would but criticized Republicans in Congress on immigration.

Denver Mayor Mike Johnston has agreed to testify at a congressional hearing on so-called "sanctuary jurisdictions," according to a statement from his office.