There have been many legal challenges to President Trump's California immigration sweeps, but one in particular could dramatically alter the policy.

The U.S. Department of Homeland Security is defending its policy of having Immigration and Customs Enforcement officers arrest people at their immigration court hearings after a group of immigrants and advocates filed a class-action lawsuit that seeks to stop the practice.

A coalition of 18 attorneys general, led by New York Attorney General Letitia James, has filed an amicus brief urging a court to halt the Trump administration's unlawful immigration enforcement raids in Los Angeles,