Defense Secretary Pete Hegseth stood by the Trump administration's National Guard federalization and U.S. Marines deployment to the Los Angeles anti-ICE riots.

The brief detention marked the first time federal troops have detained a civilian since they were deployed to the nation's second-largest city by President Donald Trump in response to protests over the administration's immigration arrests. The Marines were activated earlier this week but began their duties Friday.

A Marine Corps spokesman told BI there were concerns about prank calls, harassment, and doxxing of leaders and their families amid the protests.

It's been five days since anti-ICE demonstrations erupted in Los Angeles, some turning violent between protesters and law enforcement officers, prompting President Trump to deploy National Guard troops and hundreds of Marines.

U.S. Rep. Seth Moulton joins WBUR's Morning Edition to share his thoughts on the growing military presence in Los Angeles amid protests over immigration arrests.

Pentagon officials said the cost of deploying thousands of National Guard troops and Marines to Los Angeles is $134 million.

Infantry Marines arrived in LA with minimal training to counter civilians protesting the Trump administration's immigration crackdown.

The deployment of troops to Los Angeles raises questions about what Trump can and can't do with the military on U.S. soil, and whether he's crossing the line.