Republican presidential candidates Mitt Romney, Newt Gingrich and Rick Santorum are all scheduled to speak at a high-profile GOP conference this week where a well-known white supremacist group is also scheduled to attend.

Leading white nationalist Peter Brimelow, founder of the website, was on the agenda at the Conservative Political Action Conference that began Thursday and runs through Saturday in Washington, D.C. Brimelow spoke at a conference event titled “The Failure of Multiculturalism: How the Pursuit of Diversity is Weakening the American Identity.”

According to “America was defined — almost explicitly, sometimes very explicitly — as a white nation, for white people, and what that means is that there is virtually no figure, no law, no policy, no event in the history of the old, white America that can survive the transition to the new and non-white version. Whether we will want to call the new updated version ‘America’ at all is another question entirely.”

Democrats said Brimelow’s appearance at the GOP conference sends a clear message to minorities: you are not welcome in our party.

“The inclusion of the leader of a white nationalist hate group is shameful and the Republican Party should never have allowed this person to be part of one of its conferences,” said Deepak Bhargava, executive director of the Campaign for Community Change. “The campaign has already been filled with race baiting attacks on President Obama and this is another despicable signal that the Republican Party is out of touch with the values of America.”