In recent days, Mr. Trump has groused to several friends that he is not looking forward to leaving his new White House cocoon for high-profile, high-pressure meetings with dozens of world leaders in unfamiliar settings.

At one point, he barked at an aide that he thought his first tour abroad should be only about half as long. He will have to abandon his well-known preference for sleeping in his own bed (or in one at the hotels or golf resorts he owns) as he hops between Saudi Arabia, Israel, Belgium, Italy and the Vatican — all places without a Trump-branded property.

…Planning for the foreign trip has proceeded haltingly, with Mr. Trump resisting some of the pageantry that is usually a hallmark of a president’s travels. A visit to Yad Vashem, the Holocaust memorial museum in Jerusalem, was cut short at his request.

…Mr. Trump’s advisers acknowledge that they are concerned about his off-script eruptions, his tendency to be swayed by flattery and the possibility that foreign leaders may present him with situations he does not know how to handle. They worry he will accidentally commit the United States to something unexpected, and they have tried to caution him about various scenarios.

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Sigh….