Denver Mayor Mike Johnston testified on Capitol Hill about the so-called "sanctuary city" policies on Wednesday morning.

Mayor Mike Johnston will be in the hot seat Wednesday as he testifies before the powerful House Committee on Oversight and Government Reform over Denver's immigration policies. Why it matters: The hearing is a high-wire act for Johnston that carries major implications — both for his own political future and Denver's federal funding.

Denver Mayor Mike Johnston will soon be on his way to Washington D.C. to testify before the U.S House Oversight and Government Reform Committee to explain the city’s “sanctuary jurisdiction” policies.