Republicans have vowed to force a series of tough votes in opposition of the plan. But some of lawmakers’ most painful votes could come from one of the Senate’s foremost progressive crusaders.

Sen. Bernie Sanders (I-Vt.) says he is planning to put senators on the record with proposed amendments to Democrats’ sprawling tax, health care and climate bill, as the Senate prepares to hunker down the marathon voting session.

Sanders was key to helping craft Democrats’ earlier Build Back Better Act and has bristled over the scaled-down Inflation Reduction Act. But his chance to force floor votes on key issues important to progressives could lead to headaches for the party.

While Sanders voiced satisfaction with certain parts the narrower plan in floor remarks earlier this week, he also made pointed remarks at the bill, which he said “does virtually nothing to address the enormous crises that working families all across this country are facing today.”