Denver Mayor Mike Johnston testified on Capitol Hill about the so-called "sanctuary city" policies on Wednesday morning. He was invited by the Republican-led U.S. House Committee on Oversight and Government Reform,

Republican members of the House Committee on Oversight and Government Reform accused the mayors of undermining President Trump's mass deportation efforts.

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.