History2013United Stateshigh confidence

In 2013, the Senate reduced the cloture threshold for confirming federal judicial nominees to a simple 51-vote majority.

Notes on verification

Multiple independent contemporaneous and retrospective sources (ABA, Washington Post, CBS, Heritage Foundation) consistently confirm the exact date, vote count (52-48), and mechanism of the 2013 'nuclear option' rule change. [tier=silver indep_score=0.875 clusters=4 claim_tier=notable | kind=empirical eligibility=high]

Sources