WASHINGTON (AP) — With a last-minute trip to the Capitol, President Barack Obama sought to quell a revolt Friday among House Democrats threatening to torpedo top-priority legislation to strengthen his hand in global trade talks.

Cheers greeted the president as he strode into a meeting that could make or break a key second-term priority. But it was converts he needed to assure success of a bill to let him complete global trade deals that Congress could approve or reject but not change.

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Asked on his way back to the White House if he had nailed down the support he needed, Obama replied, “I don’t think you ever nail anything down around here. It’s always moving.”

With a scheduled vote nearing, several Democrats quoted the president as urging lawmakers to “play it straight” with their votes. That was an appeal for them to vote for a package of assistance for workers who lose their jobs as a result of trade — even if it means ultimate passage of the entire trade bill, which many of them strongly oppose.

It was unclear how much progress he made, if any, particularly among lawmakers who sought to kill the aid package as a way of stopping the trade measure from going forward.

“Basically the president tried to both guilt people and then impugn their integrity,” said Rep. Peter DeFazio, D-Ore., one of the most outspoken opponents of the legislation.

Another Democrat, Rep. Steve Cohen of Tennessee, said Obama had told Democrats that “his whole philosophy, life, everything he’s done has been to help people. And he thinks he’s doing that with this trade agreement.”

Cohen added he remains on the fence after hearing Obama make his pitch. He noted that FedEx, a major employer in his district, supports the bill, while longtime political allies in organized labor oppose it.

Business groups generally favor the measure. But strong opposition by organized labor carries at least an implicit threat to the re-election of any Democrat who votes in the bill’s favor.

The debate and vote are certain to reverberate in next year’s presidential election as well. Most Republican contenders favor the trade bill. Among Democrats, Hillary Clinton is uncommitted, despite calls from presidential rival Vermont Sen. Bernard Sanders, an opponent of the measure, to take a position.

The president’s hastily arranged visit to Capitol Hill marked a bid to stave off a humiliating defeat at the hands of his own party.

He met privately first with Rep. Nancy Pelosi of California, the House Democratic leader who remained publicly uncommitted on the measure. She and numerous fellow Democrats met privately after Obama’s departure back to the White House.

Obama’s visit relegated debate on the House floor almost to the status of a sideshow.

“Is America going to shape the global economy, or is it going to shape us?” said Rep. Paul Ryan, the Wisconsin Republican who is head of the House Ways and Means Committee and a GOP pointman on an issue that scrambled the normal party alignment in divided government.

But Rep. Sander Levin, D-Mich., countered that the legislation heading toward a showdown vote included “no meaningful protections whatever against currency manipulation” by some of America’s trading partners, whose actions he said have “ruined millions of middle class jobs.”

Democratic Rep. Barbara Lee of California, an opponent of the legislation, said Obama’s appeal “didn’t convince me. It may have convinced other members.”

Other presidents have had the authority Obama seeks, which is dubbed “fast track.” The White House wants the legislation as it works to wrap up a round of talks with 11 Pacific Area countries.

The same measure included a renewal of assistance for workers who lose their jobs as a result of global trade. Normally, that is a Democratic priority, but in this case, Levin and other opponents of the measure mounted an effort to kill the aid package, as a way of toppling the entire bill.

The move caught the GOP off-guard. House Republicans, already in the awkward position of allying themselves with Obama, found themselves being asked by their leaders to vote for a worker retraining program that most have long opposed as wasteful. Many were reluctant to do so, leaving the fate of the entire package up in the air, and Obama facing the prospect of a brutal loss — unless he can eke out what all predict would be the narrowest of wins.

“If we have to pass something that’s a Democratic ideal with all Republicans to get the whole thing to go,” said Rep. Tom Rooney, R-Fla., “we could be in trouble.”

Business groups like the Chamber of Commerce crave the deal; labor unions are ardently opposed, pointing to job and wage losses from earlier trade pacts opponents say never lived up to the hype from previous administrations.

Those colliding interests have produced unusual alliances on Capitol Hill, with House Republicans working to help a president they oppose on nearly every other issue, and most Democrats working against him.

Yet in a convoluted series of events Thursday, the fast-track bill, long the main event, seemed to fade in importance even as Republicans began sounding confident it would command enough votes to pass. Instead, Democrats began eyeing the possibility of taking down the related Trade Adjustment Assistance bill — a maneuver that would be made possible only because of rules in place for House debate.

Republicans said that the sequencing was determined at Pelosi’s behest. She has worked behind the scenes with House Speaker John Boehner, R-Ohio, this week to solve a last-minute hang-up involving Democratic concerns about cutting Medicare funds to pay for worker retraining.

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Associated Press writers David Espo, Darlene Superville, Jim Kuhnhenn, Alan Fram, Laurie Kellman and Andy Taylor contributed to this report.