A federal judge warned at a Thursday hearing that accepting the Trump administration’s assertion he has no authority to review the president’s National Guard deployment in Los Angeles is a slippery slope.

U.S. District Judge Charles Breyer said he hoped to rule later in the day on California Gov. Gavin Newsom’s (D) request to immediately restrict the troops’ power on the ground, suggesting federal law at minimum required President Trump to alert the governor.

The judge repeatedly emphasized that Trump is exercising presidential authority — not a king’s — and the role........

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