Hours after the United States failed to reach a deal to end the war in Iran, President Donald Trump on Sunday sought to ratchet up pressure on Tehran, vowing to blockade the Strait of Hormuz, a crucial waterway for Iran and the global economy. “Effective immediately, the United States Navy, the Finest in the World, will begin the process of BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz,” Trump said on social media Sunday morning.