The S&P 500 and Nasdaq indexes fell on Tuesday as a rebound in technology shares faded and as President Donald Trump said the U.S. must react to Iran’s shooting down of a U.S. helicopter. Trump wrote in a social media post that Iran had shot down the U.S. Apache helicopter that was patrolling the Strait of Hormuz overnight, and vowed to respond, which added to doubts about prospects for a truce in the Middle East war. The Cboe Volatility Index hit its highest level since April 7…
