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 appears to be building the public case for a more direct American role in the conflict. His shift in tone comes as the U.S. has repositioned warships and military aircraft in the region to respond if the conflict between Israel and Iran further escalates.