Spencer Platt/Getty ImagesDonald Trump on Saturday invoked the 1941 attack on Pearl Harbor in reaction to President Barack Obama's Friday speech in Hiroshima, the site of the world's first atomic bombing. In a tweet, the presumptive Republican presidential nominee criticized Obama for visiting the site while neglecting to mention the 1941 attack on Pearl Harbor. "Does President Obama ever discuss the sneak attack on Pearl Harbor while he's in Japan?