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President Barack Obama poked fun at everyone -- from his wife to Donald Trump -- during the annual White House Correspondents dinner, before ending his speech with a tribute to journalists who brave deadly conditions to get a story.

No one was safe from the president's zings on Saturday night, including Republican presidential challengers.

Days after releasing his long-form birth certificate to refute claims he wasn't born in the United States, the president began his address by showing what he called his birth video.

But rather than footage of a baby Barack being born in Hawaii, the clip was from Disney's "The Lion King," showing the grand unveiling of the baby Simba in Africa.

Obama then singled out an unsmiling Trump and credited him with making hard decisions -- such as firing Gary Busey over Meatloaf on an episode of "The Celebrity Apprentice" -- and succeeding in his push for the president to release his long-form birth certificate.

"Now, he can focus on more important matters like, did we fake the moon landing? What really happened in Roswell? And where are Biggie and Tupac?" Obama said, referring to Neil Armstrong's 1969 walk on the moon, the alleged UFO crash in New Mexico and the deaths of rappers Biggie Smalls and Tupac Shakur.

The president also jokingly suggested several Republicans who have signalled they might challenge him in 2012 were not born in America.

He revealed that Rep. Michele Bachmann came from Canada, talked about the full name of Minnesota Gov. Tim "Hosni" Pawlenty, and hinted that the first language of former Utah governor, Jon Huntsman, is Chinese.

Huntsman ended his tenure as Obama's appointed ambassador to China on Saturday.

"And then there's a vicious rumor floating around that could really hurt Mitt Romney," Obama said. "I hear he passed universal health care when he was governor of Massachusetts."

Not even his wife, first lady Michelle Obama, was immune to ribbing. Alluding to her push to promote healthy eating, the president said the two of them made a great team at the recent Easter egg roll: "I'd give candy ... to the kids, and she'd snatch them right back out of their hands."

The president concluded his presentation on a serious note with a tribute to the tornado-ravaged areas in the Southeast and to journalists who have been "threatened, arrested, beaten, attacked and in some cases even killed" on the job.

"No one should be silenced," Obama said. "That's what you do. And at its best, that's what journalism is."

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