U.S. Securities and Exchange Commission has decided to withdraw its appeal of a decision by a federal judge late last year to vacate an overhaul of Treasury dealer rules, according to a court document filed on Wednesday. In a statement, the SEC said it decided to dismiss the appeal because the new rule could reduce "liquidity in the Treasury markets, making them more volatile, and increasing debt for taxpayers." One year ago, the SEC under Chair Gary Gensler adopted a rule requiring proprietary traders and other firms that routinely deal in U.S. government bonds to register as broker-dealers, subjecting them to stricter oversight.