The investigation into last weekend’s mass shooting in a Texas church may launch a new round in the decades-old fight between the FBI and Silicon Valley over law enforcement’s access to encrypted data.

And this time, the government player leading the charge will be Deputy Attorney General Rod Rosenstein, who has spent months hinting that the Trump administration will take a harder line against the tech industry’s trend toward unbreakable encryption.

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“It’s basically the gloves coming off,” said Riana Pfefferkorn, a cryptography fellow at Stanford University’s Center for Internet and Society.

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Indeed, Pfefferkorn said she was “somewhat worried about the [government’s] ability to capitalize on that public sentiment.”

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Pfefferkorn accused Rosenstein of essentially calling tech companies “un-American,” a charge he denies.

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