The Senate has scheduled a September 15 cloture vote on proceeding to the CLARITY Act.Sixty votes are generally required for cloture, making Democratic support necessary if Republicans remain united.The procedural vote would open debate but would not approve the legislation or final text.White House adviser Patrick Witt has warned that failure could close Congress’s current legislative window.Banking, ethics and anti-money-laundering provisions remain contested before senators can negotiate a final bipartisan measure.