MSNBC President Phil Griffin tells The New York Times that commentator Pat Buchanan’s time on the network may be over, amid criticisms from civil rights groups that his book "Suicide of a Superpower" is racist and anti-Semitic.

Buchanan hasn’t appeared on MSNBC since he started a book tour in October, the story says. Nevertheless, he’s still employed by the network.

“During the period of the book tour I asked him not to be on,” Griffin said. “Since then the issue has become the nature of some of the statements in the book.”

Buchanan argues in his book that the "European and Christian core of our country is shrinking,” damaging the country “ethnically, culturally, morally, politically," according to the story. The book also includes a chapter called "The End of White America," the piece adds.

“The ideas he put forth aren’t really appropriate for national dialogue, much less the dialogue on MSNBC," Griffin said, according to the article.

The book has drawn protests from activist groups, as previously reported.