"When one has a hammer, everything looks like a nail. And when one’s experience is limited to real estate deals, everything looks like a lease negotiation. Hearing Mr. Trump describe his approach to foreign relations, one imagines a group of nations sitting at a table with him at its head, rather like a scene from “The Apprentice,” with him demanding more money, more troops and policy changes in exchange for American protection, trade and friendship. And if he doesn’t get what he wants? “In negotiation, you must be willing to walk,” Mr. Trump said. "His views on America’s role in the world have until now been expressed in tweets, interviews and remarks at rallies that have alarmed nearly every foreign ally of the United States." "This unilateral approach makes for good television, but this is the real world, in which other nations have agendas, too."