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Mr. Bolton also warned that crisis could erupt in North Korea, where Kim Jong-un took over as leader of the secretive communist nation in January.

North Korea has continued to build its nuclear arsenal. Kim Jong-un is still largely an unknown commodity. We just do not know what he is up to,” he said.

Mr. Bolton has served three presidents, Ronald Reagan, George H.W. Bush, and George W. Bush. He was the U.S. ambassador to the United Nations from August 2005 to December 2006.

He has also served as assistant secretary of state for international organization affairs, undersecretary for arms control and international security and as an assistant attorney general.