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

There’s no guarantee the funding will be released. President Donald Trump has ordered his administration to cut off all federal money to immigration sanctuaries to the extent it legally can. That would rip billions of dollars from some of California’s largest cities, from Los Angeles to the Bay Area.

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.

The Trump administration is suing Chicago over what are known as sanctuary laws. The administration claims the nation’s third-largest city “thwarts” federal efforts to enforce immigration laws.

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.

The lawsuit argues that the U.S. Constitution’s Supremacy Clause “prohibits Illinois, Chicago, Cook County, and their officials from obstructing the Federal Government’s ability to enforce laws that Congress has enacted or to take actions entrusted to it by the Constitution.”

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