President Trump has rewritten the U.S. foreign policy playbook with his willingness to meet anyone and go anywhere to get a deal. With his hawkish national security adviser John Bolton gone, Mr. Trump has removed one of the last dissenting voices on his impulses and instincts. So far, Mr. Trump has become the first president to set foot in North Korea and to meet its leader, and has sought to forge close ties to Russia’s president. Mr. Bolton’s exit could remove a barrier to a meeting at the United Nations with Iran’s president…

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