The irony of John Bolton’s tenure as national security adviser, which ended Monday night and was confirmed by presidential tweet on Tuesday morning, is that upon the news of his initial appointment, most foreign-policy experts in Washington worried about the damage Mr. Bolton could do abroad. He was known for his hard-line views on North Korea, Iran and other issues, and several fretted about the wars this irascible firebrand might persuade an inexperienced president to start.
Yet Mr. Bolton’s legacy is not of destruction overseas, but dysfunction in Washington. To pursue his own policy agenda and serve an erratic president, in just 17 months Mr. Bolton effectively destroyed the National Security Council system, the intricate structure that governed American foreign policy since the end of World War II. Mr. Bolton’s most lasting legacy will be dismantling the structure that has kept American foreign policy from collapsing into chaos, and finally unshackling an irregular commander-in-chief.