Gov. Gavin Newsom of California signed legislation Saturday that would prevent federal immigration agents from wearing masks in the state, a direct response to President Donald Trump's deportation crackdown in the Los Angeles region.

The new law is believed to be the first such ban in the nation, though it is likely to be challenged in court before it can go into effect in January because it is unclear whether California can enforce such restrictions on federal law enforcement. The bill also applies to local law enforcement.

In recent months, videos have spread across social media showing masked and armed immigration agents handcuffing immigrants in Southern California, drawing protests and criticism in the state.

Democratic leaders and immigration activists have suggested that agents h

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