First Draft: White House Assails Donald Trump Proposal to Let Asian Allies Get Nuclear Weapons

President Obama with President Park Geun-hye of South Korea at the Nuclear Security Summit in Washington on Thursday.Credit Doug Mills/The New York Times

WASHINGTON — A White House official said on Thursday that it would be “catastrophic” to adopt a proposal by Donald J. Trump, the Republican front-runner, that Japan and South Korea manufacture their own nuclear bombs to deter North Korea.

Benjamin J. Rhodes, the deputy national security adviser and one of President Obama’s closest aides, said, “Frankly, it would be catastrophic were the United States to shift its position and indicate that we somehow support the proliferation of nuclear weapon to additional countries.”

Mr. Rhodes, speaking at the Nuclear Security Summit here convened by Mr. Obama, said Mr….

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