OXFORD, England — It’s time to stop re-litigating Britain’s vote to leave the European Union and focus instead on threats the two countries must defeat together, Defense Secretary Ash Carter said Wednesday.

Carter, speaking at the University of Oxford’s Blavatnik School of Government, said the “special relationship” between the U.S. and the U.K. will endure despite the Brexit vote because the two partners must present a united front against two major security threats: the Islamic State and Russia.

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