The knockout blow came just as the House was taking to the floor to vote. Democratic leader Nancy Pelosi, who had been straddling the fence, said she'd vote against it, giving her caucus the last permission slip it needed to do the same.
The lower chamber did approve the critical Trade Promotion Authority that would authorize the president to negotiate the 12-nation trade accord, a nod toward continuing debate on the matter.
Explaining her no vote on the assistance package, Pelosi said she was voting to extend debate on the overall trade deal.
'So while I'm a big supporter of TAA, if TAA slows down the Fast Track, I am prepared to vote against TAA,' she said. 'I will be voting today to slow down the Fast Track, to get a better deal for the American people – bigger paychecks, better infrastructure, help the American people fulfill the American Dream.'
In the speech, which drew applause from Democrats on the House floor at the time, Pelosi said she didn't think it was fair that the Senate got to dictate the terms of the bill - which it passed two weeks ago after a lengthy debate of its own - and the House was expected to approve it without making any of its preferred changes.
'I find that unnecessary,' she said, and 'unacceptable.'
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Pelosi said she's been 'hopeful' throughout the legislative process 'we could find a path to yes for the Fast Track legislation that was being put forth – some bumps in the road along the way; some potholes along the way; unfortunately, I think, sinkholes, as well.'
'But that doesn't mean that that road cannot be repaired. I just believe that it must be lengthened,' she said.
Following this afternoon's dramatic turn over events she said in a letter to her colleagues 'the overwhelming vote today is a clear indication that it’s time for Republicans to sit down with Democrats to negotiate a trade promotion authority bill that is a better deal for the American people.'
'We look forward to working in a bipartisan way for a trade promotion authority bill that has better transparency, more consultation with Congress and stronger protections for Congressional priorities – especially labor rights and the environment,' she said, speaking on behalf of Democrats, who led the charge today against their own party leader, Obama.
The White House referred to the matter today as a 'procedural snafu' - its favored term as of late for situations in which the votes don't go their way - and the president's spokesman did his best to spin today's floor action into a short-term setback for the executive branch that it will soon overcome.
Confronted by a reporter with the cold reality that today's events were not a win for the White House, press secretary Josh Earnest said, 'I don't think that's an accurate assessment of what happened.'
That the TAA bill passed in the Senate and the TPP bill passed in both chambers suggests a favorable outcome in the end for the president, he said.
'I think if you consider the results, that's a strong endorsement of our strategy,' noting the president and his legislative team clearly have more work to do.
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