A federal judge in San Francisco seemed unconvinced after a three-day trial that the continued deployment of federalized members of California’s National Guard — who were originally deployed to Los Angeles in response to protests against President Donald Trump’s immigration agenda — is lawful.

The Los Angeles field office director for the Department of Homeland Security testified on Monday that Immigration and Customs Enforcement officers desperately needed the help of military personnel in carrying out arrests.

The trial will determine whether the Trump administration violated a 19th-century law by sending the National Guard to LA.