USA TODAYObama says he's worried about Trump's knowledge of issuesUSA TODAYPresident Obama is worried about Donald Trump becoming president because there are a lot of things “that he doesn't know and hasn't seemed to spend a lot of time trying to find out about.” Obama spoke to NBC in an interview that aired Wednesday ...What President Obama says scares him about TrumpLos Angeles Times'Anything Is Possible': Obama Now Worried About 'Scary' Donald Trump PresidencyBreitbart NewsObama on a possible Trump win: 'Anything is possible'Business InsiderDaily Caller -Mediaite -Christian Post -WPTZall 47 news articles »