Some Republicans think billionaire and reality star Donald Trump would make a good presidential candidate.
A recent Wall Street Journal - NBC News poll put Trump in second place with likely GOP primary voters. Former Massachusetts Gov. Mitt Romney came in first.
Trump said Thursday he isn't convinced that President Barack Obama was born in the United States, but says he hopes the president can prove that he was.
The real estate tycoon says not all the questions have been answered.
"I'd like to have him show his birth certificate," Trump said. "And to be honest with you, I hope he can."
In an interview broadcast Thursday, Trump told NBC News he plans to decide by June whether to run, and said that if he is the GOP nominee, "I'd like to beat him straight up," not on the basis of the question of where Obama was born.
Asked in the interview how genuine his presidential ambition is, Trump said, "I always take things seriously, but I've never taken it seriously like this. I wish I didn't have to do it."
"I wish this was the greatest place in the world," Trump said.
He added that the United States is losing respect in the world at a time when jobs at home are vanishing. He accused President Obama of giving the country "a terrible presidency."