Democratic mayors of four major cities said Wednesday that Congress and the Trump administration are exaggerating crime committed by immigrants and attacking so-called sanctuary cities simply to score political points,

Mayor Brandon Johnson testified in front of the U.S. House Oversight Committee, staunchly defending the city of Chicago and its immigrant sanctuary policies. Johnson’s opening statement alluded to the misrepresentation of sanctuary cities.

Johnson and the other mayors defended their immigration policies, saying they have an obligation to protect everyone living in their cities, regardless of their immigration status.