In 1975, the number of votes needed for cloture was reduced to three-fifths of the Senate, or 60 votes.
Notes on verification
Confirmed by Senate's official history pages, CRS report, and multiple independent journalistic/academic sources detailing the 1975 rule change from two-thirds to three-fifths (60 votes).
Sources
- Filibuster, cloture: US Senate rules featured in abortion debate | Politics News | Al Jazeera (aljazeera.com)
- https://www.congress.gov/crs-product/RL30360 (congress.gov)
- https://www.senate.gov/about/powers-procedures/filibusters-cloture.htm (senate.gov)
- https://www.senate.gov/artandhistory/history/common/generic/Origins_Cloture.htm (senate.gov)
- https://www.axios.com/2021/06/25/filibuster-evolution-debate-senate (axios.com)
- https://mondale-librarycollections.law.umn.edu/filibuster-cloture (mondale-librarycollections.law.umn.edu)