In 1975, the nuclear option, a simple majority vote conducted outside the normal rules of the Senate, was used to amend Rule 22. The number of senators required for cloture was reduced from 67 to 60. The two-thirds rule remained in effect when the Senate rules themselves were at issue. | In 1975, the nuclear option, a simple majority vote conducted outside the normal rules of the Senate, was used to amend Rule 22. The number of senators required for cloture was reduced from 67 to 60. The two-thirds rule remained in effect when the Senate rules themselves were at issue. |