Republicans are warning of a threat to national security as they seek to heighten the political pressure on Democrats opposing a GOP-led proposal to reopen the federal government.

The Trump administration is keeping all employees it deems essential on the job, meaning critical operations at the Department of Homeland Security will not stop during a shutdown. More than 90% of agency employees are expected to continue working despite the lapse in funding, according to planning documents.

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But the prospect of border agents or TSA

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