The Trump administration escalated its threats Sunday to hit Iran’s top leaders with military strikes if Tehran or its proxies carry out any attacks against American personnel or interests in retaliation for the U.S. drone strike that killed Iranian military commander Qassem Soleimani last week. “We’re going to respond against the actual decision-makers, the people who are causing this threat from the Islamic Republic of Iran,” Secretary of State Mike Pompeo said in a televised interview, expounding on a flurry of tweets a day earlier by President Trump, who warned that U.S. officials have already identified 52 possible Iranian targets,...