A federal judge in the United States has ruled that the use of National Guard troops by President Donald Trump's administration during protests over immigration enforcement in Southern California was illegal.

Judge Charles Breyer ruled on Tuesday that sending the troops to accompany federal agents in immigration enforcement operations violated federal law. However, he did not order the remaining troops to leave.

The state of California sued the Trump administration, arguing that sending troops to Los Angeles violated a law that prohibits the military from being present in domestic law enforcement. Republican government lawyers, in turn, argued that the law (Posse Comitatus Act) did not apply to the mission because the National Guard troops were sent to protect federal agents, not directly enforce laws. They also cited the president's special powers to deploy troops.

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