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President Barack Obama on Tuesday laid down perhaps his biggest verbal smackdown of Donald Trump since the famous 2011 White House Correspondents Dinner, though he wasn’t smiling as much this time around.

Obama blasted Trump and other Republican leaders who have not rescinded their endorsements of the GOP presidential candidate.

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"I think the Republican nominee is unfit to serve as president," Obama said at a press conference alongside Singapore’s Prime Minister Lee Hsien Loong. "I said so last week, and he keeps on proving it."

Obama’s remarks on Trump start at around the 59 minute mark in the video below. Read more... More about John Mccain , Mitt Romney , Republican , Paul Ryan , and Mitch Mcconnell http://pubads.g.doubleclick.net/gam...