President Obama released his birth certificate roughly five years ago, but Donald Trump is still not totally convinced he was born in the United States.

"I don't know. I really don't know. I don't know why he wouldn't release his records," the real estate mogul and 2016 Republican presidential hopeful said in a Thursday night interview with CNN's Anderson Cooper.

Trump originally said he didn't "want to get into" the issue of whether or not Obama was born in the U.S., but when prompted, he obliged. Trump made it clear that he was not alone in being a birther some years ago — Hillary Clinton and John McCain were too. However, he was the only one who got Obama to release "something."

Speculation from Trump, and others, prompted Obama to release his long-form birth certificate in April 2011 to prove he was not born elsewhere.

"Do you know that Hillary Clinton was a birther? She wanted those records and fought like hell. People forgot. You know that John McCain was a birther, wanted those records. They couldn't get the records. Hillary failed. John McCain failed," Trump said.

"Trump was able to get something. I don't know what the hell it was, but it doesn't matter. Because I'm off that subject. I'm about jobs, I'm about the military, I'm about doing the right thing for this country," he added.

During the one-one-one interview, Trump also discussed the variety of controversies flooding his presidential campaign. However, he insisted he remains "in it to win it."