Senate Confirmation Votes on U.S. Supreme Court Nominations: Overview [September 13, 2018] [open pdf - 279KB]
"After the Senate Judiciary Committee reports a Supreme Court nomination, it is placed on the Senate Executive Calendar (to be considered in executive session). Senate consideration of a Supreme Court nomination includes floor debate on the nomination, as well as a final vote by the Senate on whether to approve it. When floor debate on a nomination ends, the presiding officer puts the question of confirmation to a vote. A roll call vote to confirm requires a simple majority of Senators present and voting, a quorum being present. Since 1967, beginning with the confirmation of Thurgood Marshall, every Senate vote on whether to confirm a Supreme Court nomination has been by roll call (prior to 1967, most confirmation votes were by voice vote)."
CRS Insight, IN10966
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html