For weeks, President Obama kept quiet as the Donald helped fuel "birther" conspiracy theories.

"He doesn't have a birth certificate," Trump told "Good Morning America" in spring 2011. "He may have one, but there is something on that birth certificate -- maybe religion, maybe it says he's a Muslim, I don't know. Maybe he doesn't want that. Or, he may not have one." Trump also told a tea party rally that Obama "almost certainly will go down as the worst president in the history of the United States."

But Obama seemed to get the last laugh when, right after releasing his long-form birth certificate, he lampooned Trump at the White House correspondents' dinner. "Now he can get to focusing on the issues that matter," the president said. "Like, did we fake the moon landing? What really happened at Roswell? And where are Biggie and Tupac?" Zing!
But that didn't quiet Trump. The Donald fired back during Obama's 2012 presidential campaign with a "big announcement" goading Obama to release his college transcripts the October before the election so that he would donate $5 million to charity. Turns out the offer was one the president could easily refuse.