PHILADELPHIA—U. K. Prime Minister Theresa May cautioned the U.S. against withdrawing from world affairs on Thursday, saying that the relationship between the U.S. and the U.K. is one of the “greatest forces for progress this world has ever known.”Without mentioning Mr. Trump’s “America First” policy, Mrs. May told a gathering of House and Senate Republicans that the two countries couldn’t afford to stand idly by when it is in their...

Source: Wall Street Journal January 26, 2017 22:00 UTC