The U.S. Justice Department said on Thursday it was probing the release by an upstate New York sheriff's office of an immigrant living in the U.S. illegally, in what appears to be its first use of a new policy to target state and local agencies that do not comply with President Donald Trump's directives.

One legal expert told 13 ON YOUR SIDE the phrase "sanctuary city" on its own has no legal meaning. But, he explained, there is a typical understanding of it.

As President Donald Trump takes action on immigration and deportations, Republicans in New Hampshire are proposing their own slew of laws.

Representative James Comer has asked the mayors of Boston, Chicago, Denver and New York City for documents and information on their sanctuary policies.

The mayors of those cities are being called to testify before Congress. Fact check: $50 million for condoms in Gaza? Five big reasons to be skeptical Trump’s story is true

U.S. Rep. James Comer has asked four Democratic mayors to testify before the House Oversight and Government Reform Committee.

Four sanctuary cities are under federal investigation for their immigration policies, including Denver, Chicago, New York City and Boston.

Chicago and other cities like it — notably Denver, New York and Boston, all of which hold sanctuary city status like Chicago — are being investigated by the U.S. House Committee on Oversight and Government Reform.