(Updated below.)

Conservative commentator Pat Buchanan has been suspended indefinitely from MSNBC, according to a statement from that network’s President Phil Griffin. An Associated Press article on CBSNews.com blames reaction to Buchanan’s latest book Suicide of a Superpower for his ouster from the cable network, as well as a campaign by the advocacy group, Color of Change.

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The former Nixon aide has long courted controversy. In April of this year he said that President Obama’s path to the White House was the result of “Affirmative Action all the way.” In 2009, he asserted that the U.S. “has been a country built, basically, by white folks.”

MSNBC’s Griffin apparently believes, however, that Buchanan’s newest work has crossed a line. Suicide of a Superpower came out in October and features chapters with titles like “The End of White America” and “The Death of Christian America.”

The AP quotes Griffin as saying, “Because of the content of the book, I didn’t think it should be part of the national dialogue, much less part of the dialogue on MSNBC.”

The network executive said that there has been no decision as to whether Buchanan will be allowed at any point to re-join the network’s political team. He also refused to reveal any details about the terms of Buchanan’s contract with the network or whether it would be renewed.

UPDATE: Color of Change has issued a statement regarding MSNBC’s decision to suspend Pat Buchanan. The activist group says: “ColorOfChange.org welcomes MSNBC’s decision to indefinitely suspend Pat Buchanan. However, it’s time for MSNBC to permanently end their relationship with Pat Buchanan and the hateful, outdated ideas he represents. We appreciate this first step and urge MSNBC to take the important final step to ensure that their brand is no longer associated with Buchanan’s history of passing off white supremacy ideology as mainstream political commentary.”