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The Office of Congressional Ethics referred the case to the House Ethics Committee, and the investigation has taken several months.
Waters has stated that she disclosed that her husband Sidney Williams had ties to the bank, that he owned stock, and was on the board.
The House ethics committee declined Friday to make any public statement on the matter.
New York Democrat Rep. Charles Rangel also faces an ethics trial this fall on charges that include failure to disclose assets and income, nonpayment of taxes and doing legislative favors for donors to a college center named after him.
While Rangel is a former chairman of the tax-writing House Ways and Means Committee, Waters is a prominent member of the House Financial Services Committee.
Maxine Waters, like Rangel, could settle her case by arranging a plea bargain with the ethics committee. Far left liberal nutcase Maxine Waters has ethics problems - big time. The funding came three months after Waters, a senior member of the committee that oversees banking, helped arrange a meeting between officials of the bank, other minority-owned financial institutions and Treasury Department representatives.
Waters' husband, Sidney Williams, had owned stock in the bank and served on its board.
Troubled OneUnited Bank in Boston didn't look much like a candidate for aid from the Treasury Department's bank bailout fund last fall.