Donald Trump on Monday suggested he had broadened the scope of his investigation regarding President Obama's background, arguing that - in addition to making inquiries into Mr. Obama's citizenship - he was "looking into" the president's college career. In an interview with the Associated Press, Trump alleged that Mr. Obama had been "a terrible student," and wondered how he could have been accepted to prestigious schools like Columbia and Harvard Universities. "I heard he was a terrible student, terrible," Trump told the AP. "How does a bad student go to Columbia and then to Harvard? I'm thinking about it, I'm...