A high-level Trump administration official informed Iran on Sunday of the impending U.S. operation to "guide" ships through the Strait of Hormuz and warned Tehran not to interfere, according to a U.S. official and a source with knowledge. Why it matters: The private message suggests the White House wanted to try to mitigate the risk of potential escalation. But despite the warning, the Iranians launched a string of attacks on U.S. Navy ships, commercial vessels, and the United Arab Emirates. St