WASHINGTON — The Trump administration told states that they must “immediately undo” any actions to provide full food stamp benefits to low-income families, in a move that added to the chaos and uncertainty surrounding the nation’s largest anti-hunger program during the government shutdown.

The Agriculture Department issued the command late Saturday in a memo, which The New York Times later viewed. That guidance threatened to impose harsh financial penalties on states that did not “comply” quickly with the new federal orders.

The memo surprised, vexed and frustrated many state leaders, and by Sunday, some had begun to explore their legal options to prevent any further disruptions to the Supplemental Nutrition Assistance Program, or SNAP. But the Trump administration held firm in its refus

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