After breezing through his usual lines about wanting to build a border wall and to “drill baby‚ drill” for oil‚ former President Donald Trump has been adding a new refrain to his speeches — a promise to build something like Israel’s Iron Dome‚ but better and over the entire U.S. “We’ll build an Iron Dome over our country‚ a state-of-the-art missile defense shield‚ and it’s all made in the USA‚” Trump said Sunday at a rally in New Hampshire. “I think it’s time that we have one.” “I will...