Four top aides to North Carolina's Republican candidate for governor resigned on Sunday, three days after CNN reported that he once called himself a "black NAZI!" and proposed bringing back slavery in comments posted on a pornography website.

North Carolina Lt. Gov. Mark Robinson avoided directly weighing in during a gubernatorial campaign event Saturday on a CNN report outlining evidence that he made disturbing posts on a pornography website’s message board more than a decade ago.

The emergence of Robinson's scandal sparked concerns that the state's gubernatorial candidate could harm Donald Trump's chances in the state.