National Guard troops arrived in downtown Los Angeles on Sunday morning after being ordered into the city by President Trump in response to a weekend of violent clashes between law enforcement officers and protesters triggered by immigration enforcement operations in the area on Friday.

A leader of one of the biggest unions in California was arrested amid protests against federal immigration raids in the Los Angeles area.

A local immigrant rights organization said more than 45 people were detained in the operations, which were described as “random sweeps.”