Trump’s Iran threats face ‘Obama red line’ test as White House pivots to diplomacy

For weeks, President Donald Trump has promised the Iranian people that "help is on the way" while positioning a massive U.S. naval armada within striking distance of Iran’s coast. But as the White House pivots toward a diplomatic summit in Istanbul Friday, analysts warn the president may face a growing credibility test if threats are not followed by action.

By threatening "speed and fury" against a regime accused of killing thousands of protesters, Trump has drawn a red line — one that analysts...