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Ross said a large part of an ambassador’s job involves taking part in social gatherings, something Wintour would be comfortable with. Often most of the real political work is done by direct communications between the White House and the prime minister’s office at Downing Street, he said.

“That diminishes the political significance of the ambassador’s role,” he said.

Mary Jo Jacobi, a presidential adviser during two Republican administrations, said Wintour would be an unusual choice but possibly an effective one.

“Vogue is a very successful, very large publication, and she has experience with big budgets and with challenging, difficult people,” Jacobi said. “She knows how to marshal resources. And her job has involved a great deal of diplomacy.”