Republican presidential candidate Donald Trump at a rally in Oskaloosa, Iowa, last month. (Charlie Neibergall/AP)

Donald Trump’s campaign fired a staffer Sunday for what it said were racially offensive Facebook posts.

“Effective immediately, Sam Nunberg, a low-level political adviser, is no longer associated with the Donald Trump For president campaign,” Trump campaign manager Corey Lewandowski said in an interview.

The firing, first reported by CNN, followed a report Friday by Business Insider that Nunberg had posted slurs and other offensive content on his private Facebook page in entries dating to 2007.

In one post, Nunberg allegedly called the Rev. Al Sharpton’s daughter a “n-----.” In another, he allegedly called President Obama a "Socialist Marxist Islamo Fascist Nazi Appeaser" and mocked Obama's proposal for "Kenyan" health-care reform, Business Insider reported. The posts have apparently been removed, although Nunberg’s Facebook account remained active Sunday.

Nunberg’s current profile picture is a skull with the words "Keep Calm and Take Revenge,” but an earlier version with his likeness is below.

Nunberg denied to CNN that he had written the posts, but Lewandowski said Sunday that “independent verification showed … they were on his account.”

Trump “does not condone” the Facebook messages, Lewandowski said. “We have no tolerance for that in a presidential campaign,” the campaign manager said.

Nunberg had told CNN on Friday that "anything that was posted under my name does not mean I posted it."

This is the second time that Trump has fired Nunberg. He was dismissed as a Trump aide last year, reportedly for facilitating an unflattering BuzzFeed profile of Trump.

Correction: An earlier version of this article said Nunberg had previously been fired in 2012. He was first fired in 2014.

Read more:

Donald Trump’s false comments connecting Mexican immigrants and crime

Poll: Trump surges to big lead in GOP presidential race