Trump challenges sanctuary cities in court, testing federal vs. state power on immigration. Legal battle could reshape enforcement and Supreme Court precedent.

The counties of San Francisco and Santa Clara in California in addition to King County, Washington and the cities of Portland, Oregon and New Haven, Connecticut have filed a lawsuit against the Trump administration alleging it has threatened and unlawfully targeted sanctuary jurisdictions,

The Trump administration is making moves to withhold U.S. Department of Justice funds from cities and states with "sanctuary" laws the administration claims thwart federal efforts to enforce immigration laws.

A coalition of U.S. cities and counties on Friday filed a lawsuit challenging President Donald Trump's executive order seeking to force so-called sanctuary jurisdictions to cooperate with his immigration crackdown and mass deportations.

New Haven Mayor Justin Elicker said the lawsuit is meant to protect the city’s place as a sanctuary for undocumented immigrants

The City of San Francisco is leading a lawsuit against the Trump administration over its crackdown on sanctuary cities and states and its threat to cut off federal funding.

President Donald Trump has often singled out Chicago and Illinois, which have some of the nation's strongest protections for immigrants. Top administration officials last month visited the city to launch stepped up immigration enforcement and showcased footage of “border czar” Tom Homan making arrests on live television.

A coalition of cities and counties in blue states have sued the Trump administration over alleged threats and "illegal targeting" of sanctuary cities.