Final answer:
The Senate rule used to end debate on a bill currently requires a minimum of 60 votes.
Step-by-step explanation:
The Senate rule used to end debate on a bill currently requires a minimum of 60 votes. This rule is known as the cloture rule or the filibuster rule. It allows the Senate to end a filibuster or extended debate on a bill and proceed to a final vote.
Learn more about Senate rule to end debate on a bill