The Center for Immigration Studies (CIS) reports that: “More than 200 cities, counties, and states across the United States are considered sanctuaries that protect criminal aliens from deportation by refusing to comply with ICE detainers or otherwise impede open communication and information exchanges between their employees or officers and federal immigration agents. These state and local jurisdictions have policies, laws, executive orders, or regulations to this effect. These sanctuary policies obstruct federal law authorizing U.S. Immigration and Customs Enforcement (ICE) to administratively deport illegal aliens without seeking criminal warrants or convictions from federal, state, or local courts.”
Read more at cis.org.