Senator Joe Manchin III, Democrat of West Virginia, pulled the plug on Thursday on negotiations to salvage key pieces of President Biden’s agenda, informing his party’s leaders that he would not support funding for climate or energy programs or raising taxes on wealthy Americans and corporations.
The decision by Mr. Manchin, a conservative-leaning Democrat whose opposition has effectively stalled Mr. Biden’s economic package in the evenly divided Senate, dealt a devastating blow to his party’s efforts to enact a broad social safety net, climate and tax package.