WASHINGTON (AP) — Republican presidential candidate Herman Cain is investigating possible improper financial arrangements between a charity and his campaign.The Milwaukee Journal Sentinel reported Monday that Cain, who also is dealing with sexual harassment allegations from the 1990s, allowed a tax-exempt charity to illegally provide money to help Cain's campaign get started.Cain's chief of staff, Mark Block, says the campaign has asked a lawyer to review the transactions. Block says the campaign will comment when that investigation is over.The charity, Prosperity USA, was founded by Block and Linda Hansen, Cain's deputy chief of staff. The Journal Sentinel reported there are questions about approximately $40,000 that helped Cain's campaign get started earlier this year.