Former National Security Advisor Dr. Zbigniew Brzezinski appeared on MSNBC's Morning Joe Wednesday to discuss how income disparity in the United States could lead to civil unrest.

He said civil unrest was likely if the middle class became more severely affected by America's growing income disparity and economic troubles.

"I don't want to be a prophet of doom -- and I don't think we are approaching doom -- but I think we're going to slide into intensified social conflicts, social hostility, some forms of radicalism, there is just going to be a sense that this is not a just society," Brzezinski said.

He added that the United States had slid into a pattern of "really drastic" social inequality, and that the inequality could only be endured if the whole country was economically successful -- which it is not.

Watch video, courtesy of MSNBC, below:

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