After Donald Trump’s relentless crusade debating President Barack Obama's American citizenship, the commander-in-chief, along with first lady Michelle Obama, appeared on "Oprah" to publicly denounce the naysayers.After the White House released his birth certificate from Hawaii earlier today, Obama spoke his piece during a taping of the show on "once again" having to confirm his status as a U.S. citizen. "Keep in mind what had happened," the President uttered. "This came up two and a half years ago, and so we called up the folks in Hawaii and the Department of Health."The entertaining part of the interview was when everyone, including Oprah Winfrey and her audience, shared a hearty laugh at Obama's recollection when the queen of daytime asked him if he had any doubts when the issue initially came up. "Can I just say? I was there, so I knew that I had been born." (ETonline.com)