GOP front runner Donald Trump has been under the microscope for refusing to disavow racist terror group the KKK and one of its leaders, David Duke.

On Saturday during a rally in Florida, the real estate mogul made comments about President Barack Obama's race. Trump has been an unapologetic birther, meaning he subscribes to a debunked conspiracy theory that Obama is not an American citizen. The so-called birther movement has been largely written off as a racist attack on the nation's first non-white president.

On Saturday, Trump said, "We have a terrible president who happens to be African-American.”

He then promised that he could unite the country.

Watch Trump's remarks, as posted to YouTube, here: