Dealing with North Korea’s ambitions for nuclear weapons has vexed the past four U.S. presidents.
Since North Korea withdrew from the Nuclear Nonproliferation Treaty in 2003, it has detonated nuclear explosive devices five times and made steady progress on its ballistic missile program. In late July, Pyongyang tested an intercontinental ballistic missile that many analysts say could reach the West Coast of the United States and possibly beyond.
Since then, President Donald Trump and North Korean leader Kim Jong Un have traded bellicose rhetoric, while Secretary of

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