Mark Block, Herman Cain's chief of staff, said on Monday the candidate for president had "never sexually harassed anybody. Period. End of story."

Block's comment on MSNBC comes a day after Politico reported allegations that Cain engaged in inappropriate behavior with two women when he was head of the National Restaurant Association.

Cain, who in recent weeks has become a contender for the Republican nomination for president, is in Washington Monday, speaking at AEI about his tax plan.

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