The Justice Department is reviewing Oakland Mayor Libby Schaaf’s “outrageous” warning to the community ahead of a large-scale operation by federal immigration authorities, the White House said Thursday.

“I think it’s outrageous that a mayor would circumvent federal authorities and certainly put them in danger by making a move such as that. And that’s currently under review by the Department of Justice, and I don’t have anything else to add,” press secretary Sarah Huckabee Sanders said in her afternoon briefing at the White House.

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“It can’t be a corrupt intent simply to have the desire for someone to avoid prosecution,” said Professor Robert Weisberg of Stanford Law School. “This is just going to be fought out between the feds and the locals, but I don’t think obstruction will come into play. How would this differ from somebody saying, ‘The San Francisco Police Department is using more resources to patrol neighborhood X for drugs’?”

Neither warning would be directly interfering with an investigation, and thus would not count as obstruction, Weisberg said.