The House Oversight and Government Reform Committee will have a hearing on Wednesday morning to hold four of the country’s most powerful mayors “publicly accountable” for their “sanctuary city” policies.

Mayors from four major cities are set to testify Wednesday in Congress as Republicans take aim at “sanctuary cities," arguing that they impede the Trump administration’s mass deportation agenda and protect people who are in the United States illegally.

Here's a rundown of several key claims made during the hearing, and our reporting on the issues and numbers referenced by officials.

"Migrants did not bring a wave of crime to Denver." Mayors of several large cities defended their policies in front of the House Oversight Committee.

Democratic mayors of four major cities testified before the House Oversight Committee over their cities' policies limiting cooperation with immigration enforcement under the Trump administration.

The mayors of four so-called “sanctuary cities” faced tough questions from lawmakers about their policies toward immigrants and how they work with Immigration and Customs Enforcement at a House Oversight and Government Reform Committee on Wednesday.