what is the filibuster rule
A filibuster is a parliamentary procedure where debate over a proposed piece of legislation is extended, allowing one or more members to delay or entirely prevent a vote on the proposal.
A filibuster in the United States Senate is a dilatory or obstructive tactic used to prevent a measure from being brought to a vote. The most common form of filibuster occurs when a senator attempts to delay or entirely prevent a vote on a bill by extending the debate on the measure, but other dilatory tactics exist.