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 on Thursday defended its policy of having Immigration and Customs Enforcement officers arrest people at their immigration court hearings after a class-action lawsuit was filed that seeks to stop the practice.

The Trump administration on Monday asked a federal appeals court to pause a sweeping order from a California judge that required officials to stop making immigration arrests without probable cause in the southern part of the state.