President Obama scrambled for votes Monday as Democratic support trickled in for his trade agenda, despite strong pressure from unions.

Labor groups led by the AFL-CIO are furiously lobbying Democrats to oppose fast-track authority when the Senate votes on a procedural motion Tuesday.

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The measure would help Obama negotiate the largest trade deal in history with 11 other countries along the Pacific Rim by limiting interference from Congress.

Obama’s trade bill needs 60 votes, and he can afford no more than two Democratic defections who previously backed fast-track. As of Monday evening, he had not yet secured public promises from all the Democrats he needs.

Backers of fast-track likely need a dozen Democratic votes because five of the Senate’s Republicans voted against the trade package last month and Sen. Ted Cruz Rafael (Ted) Edward CruzMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (R-Texas) is indicating in an op-ed on Breitbart News that he will change his vote from yes to no. Cruz, who is running for president, says he is wary of backroom negotiations, expressing concern that the Export-Import Bank reauthorization will be included in the horsetrading.

Sens. Maria Cantwell Maria Elaine CantwellHillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes Bipartisan senators call for investigation of popular fertility app The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans MORE (D-Wash.) and Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (D-N.D.) said Monday they are still reviewing their options, while Sen. Ben Cardin Benjamin (Ben) Louis CardinPPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help Senate passes extension of application deadline for PPP small-business loans MORE (D-Md.) insisted he wants fast-track to remain bundled with Trade Adjustment Assistance (TAA), an aid program for workers hurt by foreign competition.

Democratic Sens. Chris Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (Del.), Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (Colo.), Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (N.H.) and Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (Mo.) declined to say Monday evening how they would vote.

Cantwell told reporters last week she would vote against fast-track because it was not attached to TAA, but her office walked back the comment Monday.

Heitkamp is holding out for a guarantee that the Export-Import Bank will be reauthorized before its charter expires on June 30.

Sen. Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (Wash.), the fourth-ranking member of the Democratic leadership and one of the leaders of the Senate’s pro-trade Democrats, declined to say how she would vote.

Obama got a boost Monday afternoon, however, when Sen. Ron Wyden Ronald (Ron) Lee WydenGOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate GOP senator blocks Schumer resolution aimed at Biden probe as tensions run high MORE (D-Ore.) announced he would support fast-track, even untethered from TAA.

Wyden and other pro-trade Democrats have wavered over the past week because GOP leaders split the legislation after House Democrats defeated TAA in a bid to derail the broader agenda.

In the end, Wyden and other Democrats realized they had gone too far out on a limb to turn back, having voted last month for a trade package that included both.

“The trade package currently before the Senate is a blueprint for trade done right,” Wyden said in a statement. “It will make our country stronger by opening new markets to American products and creating new opportunities for good-paying American jobs.”

Democratic Sens. Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (Del.), Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (Fla.), Dianne Feinstein Dianne Emiel FeinsteinNames to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (Calif.) and Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE (Va.) signaled Monday they will also vote for fast-track.

“I intend to vote for cloture on the Trade Promotion Authority bill because the facts show that expanded trade with the Asia-Pacific region helps California and the country as a whole,” Feinstein said in a statement.

Supporters of fast-track argue that trade supports more than 4.7 million jobs in California.

Treasury Secretary Jack Lew Jacob (Jack) Joseph LewApple just saved billion in tax — but can the tax system be saved? Lobbying World Russian sanctions will boomerang MORE on Sunday described an all-out lobbying offensive by the administration.

“One thing I can say is the president spared no effort on this. He’s talked to more members than I can count, more senators than I can count, and everyone in the Cabinet, including myself, is doing their job to try and get this across the finish line,” he told CNN’s Fareed Zakaria.

White House press secretary Josh Earnest told reporters Monday that Obama would keep up the pressure campaign until the vote.

“I do think the president will be engaged in that effort,” he said.

The Senate’s vote Tuesday to end debate on fast-track — if it gets 60 backers — will set up a final roll call on the measure later in the day or Wednesday.

The chamber would then vote on a package of trade preferences combined with the African Growth and Opportunity Act and TAA. That measure is expected to clear Wednesday or Thursday.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellOcasio-Cortez to voters: Tell McConnell 'he is playing with fire' with Ginsburg's seat McConnell locks down key GOP votes in Supreme Court fight Video shows NYC subway station renamed after Ruth Bader Ginsburg MORE (R-Ky.) predicted Monday that both would make it to Obama’s desk by week’s end.

“Now I know how important it is, particularly for my friends on the other side of the aisle, to get both TPA [trade promotion authority] and TAA done,” McConnell said on the floor. “It’s why I set in motion a process last week — filing cloture on the vehicles for both TPA and TAA so that we get one done followed immediately by the other — that will put both pieces of legislation on the president’s desk before the July 4 [recess].”

McConnell has promised Democrats that a customs and enforcement bill that needs to be reconciled with a version from the House will also make it to Obama for a signature.

Senate Democratic leaders are not whipping against fast-track, leaving it to unions to do the heavy lifting to defeat it.

The AFL-CIO urged Democrats Monday to vote against fast-track and warned they had no guarantee that TAA will pass the House, where many Republicans oppose it.

“Without assurances that TAA will pass the House, or that the customs bill will ever see the president’s desk, considering Fast Track prematurely could compound its expected negative impacts, leaving U.S. workers in the lurch and depriving the U.S. manufacturing sector of vital tools necessary to combat unfair trade,” William Samuel, the union’s director of government affairs, wrote in a letter to senators.

A turning point in his negotiations with pro-trade Democrats came when McConnell offered to add to the mix legislation that would help U.S. companies petition the Commerce Department and International Trade Commission to respond to infractions of trade rules.

The Leveling the Playing Field Act, sponsored by Sens. Sherrod Brown Sherrod Campbell BrownBipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Ohio) and Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (R-Ohio), a close ally of McConnell’s, is attached to the package of trade preferences and worker assistance.

“We urged Republican leaders to include Sen. Brown’s trade enforcement bill as a sign of good faith that Republican leaders will do what is necessary to ensure the entire trade package gets done,” Wyden said in his statement, describing his “round-the-clock discussions” with McConnell.

Heritage Action for America urged Republican senators to vote against fast-track Tuesday.

The conservative advocacy group argued that passing fast-track would pave the way for later passage of what it called the “ineffective” TAA program, which is paid for with tax penalties.

“The new pay for — included in H.R. 1295 which the Senate will also consider this week — increases revenue by raising certain tax penalties. New spending should not be offset by new revenues,” the group wrote in a legislative alert Monday.

Jordan Fabian and Vicki Needham contributed to this article, which was updated to reflect Sen. Ted Cruz's (R-Texas) position on June 23 at 9 a.m.