Fireworks flew on live TV as CNN's Wolf Blitzer and Donald Trump went at it over President Obama's place of birth.
"Donald, you're beginning to sound a little ridiculous, I have to tell you," said Blitzer.
"No, I think you are Wolf," replied Trump, "There are many people that don't agree with that birth certificate, they don't think it's authentic, Wolf," said Trump.
"I don't know when you say 'many people' don't agree—give me a name," said Blitzer.
"I don't give names," replied Trump.
Trump—who called into CNN from Las Vegas—resurrected the now discredited birther debate as he hosted a $2 million fundraiser for Mitt Romney in Sin City.
It was supposed to be Romney's big day, as he clinched the Republican presidential nomination. But all the talk was about Trump.
"Romney, on His Big Day, Finds Himself Upstaged," said the New York Times. It said Trump "hijacked" what should have been Romney's "day of triumph."
The Romney campaign had no choice but to release this statement: "Governor Romney has said repeatedly that he believes President Obama was born in the United States."
The White House is calling Trump's rhetoric "a ridiculous distraction."
The Romney campaign also released his birth certificate—at the request of the Reuters News Agency. It shows that Romney is an American citizen, born in Detroit in 1947. His father, George Romney, who was a presidential candidate back in 1968, was actually born in Mexico, but to American parents—making him a U.S. citizen.