Military-style vehicles and National Guards troops have blocked a portion of 4th Street in front of the Ronald Reagan Federal Building and Courthouse.

Defense Secretary Pete Hegseth forcefully defended the deployment of National Guard troops and U.S. Marines to Los Angeles during a hearing on Tuesday.

National Guard troops began protecting immigration agents as they made arrests in Los Angeles on Tuesday, an expansion of their duties that been limited to protecting federal property. THIS IS A BREAKING NEWS UPDATE.

The restraining order request is focused on a growing expectation among California officials that troops will soon be sent on arrest missions.

DHS Assistant Secretary Tricia McLaughlin called the decision "deeply disturbing," accusing state officials of siding with criminals over public safety.

Defense Secretary Pete Hegseth on Tuesday defended the administration's mobilization of the National Guard and members of the Marine Corps to Los Angeles amid ongoing immigration protests.

Gov. Gavin Newsom announced a lawsuit against the Trump administration for federalizing the National Guard in L.A. County over the weekend, saying the president abused his authority.

President Donald Trump has built his presidency around stretching the bounds of presidential authority, and his response to protests over an immigration crackdown in Los Angeles is no exception.

HOW WE GOT HERE: The protests erupted after Immigration Customs Enforcement (ICE) officers on Friday carried out raids in three locations across L.A., where dozens of people were taken into custody. Newsom called the raids “chaotic federal sweeps” that aimed to fill an “arbitrary arrest quota.”