The Trump campaign says longtime aide Sam Nunberg was fired.
The website Business Insider reported the posts Friday. They included including a racist slur to describe the Rev. Al Sharpton's daughter and references to President Barack Obama as a "Socialist Marxist Islamo Fascist Nazi Appeaser" and former Arkansas Gov. Mike Huckabee as "Huckahick."
Nunberg told the website he was shocked and didn't recall writing the messages
Nunberg has spent years working for Trump's organization and has been fired before, in 2014 when Buzzfeed published an unflattering profile of Trump.
Trump's lawyer apologized recently for making what he called an "inarticulate" comment about spousal rape to the Daily Beast.