NYT – Mexico’s president, Enrique Peña Nieto, had already had a terrible summer. July was the most murderous month in Mexico since he took office in 2012. Second-quarter results showed negative economic growth for the first time in three years. A survey found his approval rating slipping to 23 percent. And a news report even alleged that he plagiarized nearly a third of his law degree thesis. How could he make it any worse? Only by inviting Donald J. Trump, one of the most hated men in Mexico — so hated that piñatas with his visage are brisk sellers across the country — to his presidential palace.