In the span of about eight hours, President Donald Trump went from suggesting a nuclear deal with Iran remained “achievable” to urging Tehran’s 9.5 million residents to flee for their lives as he cut his visit to the international G7 summit short to return to Washington for urgent talks with his national security team. Trump, who said he plans to meet with advisers in the Situation Room, appears to be gradually building the public case for a more direct American role in the conflict.