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Billionaire Donald Trump at at 2011 Florida Tea Party Rally.
Trump again questioned the authenticity of President Obama's birth certificate, and belabored the birther issue during a phone interview that deteriorated into the men calling each other "ridiculous."
"A lot of people do not think it was an authentic certificate," said Trump, though he declined to give names of the experts who agreed with him, notes The Situation Room.
Blitzer suggested that Trump was starting "to sound a little ridiculous" in light of the state of Hawaii confirming the president's citizenship.
Trump fired back, "I think you sound ridiculous."
"Did the conspiracy start in 1961 when the Honolulu Star Bulletin and the Honolulu advertiser contemporaneously published announcements that he was born in Hawaii?," Blitzer asked.