Visit by Mexican Leader Highlights Unlikely Friendship With President Trump

MEXICO CITY—U.S. President Donald Trump and Mexican President Andrés Manuel López Obrador will maintain their first face-to-face assembly on Wednesday in Washington, D.C., a doubtlessly dangerous encounter for the Mexican chief who has entered right into a helpful marriage of comfort with Mr. Trump since being elected president two years in the past.

On paper, the one-day go to to Washington—the primary journey overseas by the Mexican chief as president—is partly to have fun the United States–Mexico–Canada Agreement coming into pressure on July 1….