Bipartisan negotiations over Senate rule changes to fast-track presidential nominees crumbled Thursday, leading to a dramatic showdown on the chamber floor and Republicans barreling ahead with the latest step to eventually bypass Democratic roadblocks.

The GOP-led Senate moved to lower the 60-vote threshold for a resolution containing dozens of nominees, which aims to modify chamber rules to bundle an unlimited number of certain nominees for swift confirmation, to a simple majority. The endeavor cleared along party lines, 53-45.

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