“Last year, we voted on the Working Families Tax Cut, the single largest tax cut in American history. Every single Democrat in the House voted against it. Every single Democrat in the Senate voted against it.”

The One Big Beautiful Bill / Working Families Tax Cuts was passed with all Democrats voting against in both chambers (House 218-214, Senate 51-50 with VP tiebreak), but it is not the single largest tax cut in American history when measured as a percentage of GDP; PolitiFact rates similar claims Mostly False, ranking it lower.