Iran’s new supreme leader has vowed to keep blocking the Strait of Hormuz, attack US bases and avenge the blood of its martyrs in his first statement since succeeding his father. US President Donald Trump responded with an insult and threat soon after. “The lever of blocking the Strait of Hormuz must definitely be used,” Mojtaba Khamenei said about the strategic waterway, which carries about a fifth of global oil shipments. Khamenei urged Iran’s Gulf neighbours to close US military bases in the...