Walmart’s chief executive issued a strong rebuke of President Trump’s response to the protests that turned violent in Charlottesville, Va., saying the president “missed a critical opportunity to help bring our country together.” The criticism came in a statement that the retailer’s chief executive, Doug McMillon, emailed to employees Monday evening, which was reviewed by The New York Times. The statement was later posted on a company website. “As we watched the events and the response from President Trump over the weekend, we too felt that he missed a critical opportunity to help bring our country together by unequivocally rejecting...