Entering No. 10 Downing Street as prime minister on Wednesday, Boris Johnson will finally attain his lifelong ambition. But he faces many challenges — challenges that President Trump can help him overcome.

First and foremost, Johnson must somehow find a way to deliver Brexit by Oct. 31. The European Union is trying to delay Brexit, but Johnson says the date will hold. His challenge, then, is to somehow persuade the EU to grant some more concessions, something the political bloc says it won’t do. Johnson must also persuade a majority in the House of Commons to approve any new deal. This won’t be easy.

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