The GOP-controlled Senate is poised to pass a Democratic resolution Thursday blocking President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s declaration of a national emergency to build a wall on the Mexican border.

Talks within the GOP conference to avoid an embarrassing rebuke for Trump collapsed Wednesday, and Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) joined four fellow Republican senators who have already said they will back the measure.

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Many more are expected to vote against Trump on Thursday. Members of both parties believe he went too far in declaring an emergency to secure funding for a wall that he could not win through the appropriations process — or an extended government shutdown that was a black eye for the Republican Party.

The House has already approved the resolution, meaning Trump will be forced to use his veto power for the first time.

GOP Sens. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine), Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (Alaska), Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (N.C.) and Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (Ky.) have said they will back the measure. Sens. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (Fla.), Mitt Romney Willard (Mitt) Mitt RomneySenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Utah), Lamar Alexander Andrew (Lamar) Lamar AlexanderGraham: GOP has votes to confirm Trump's Supreme Court nominee before the election The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (Tenn.), Johnny Isakson Johnny IsaksonLoeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Loeffler: Trump 'has every right' to fill Ginsburg vacancy before election MORE (Ga.), Ron Johnson Ronald (Ron) Harold Johnson CIA found Putin 'probably directing' campaign against Biden: report This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda GOP set to release controversial Biden report MORE (Wis.), Ben Sasse Benjamin (Ben) Eric SasseGovernment watchdog recommends creation of White House cyber director position Chamber of Commerce endorses McSally for reelection Ben Sasse is mistaken with idea for the election of senators in America MORE (Neb.) and Jerry Moran Gerald (Jerry) MoranLobbying world This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (Kan.) are among the Republicans who could join them.

Republicans control 53 seats in the chamber, and Democrats are set to back the resolution unanimously. A GOP aide said the high-water mark for votes against Trump is likely 12 Republicans and 59 senators overall.

A senior Senate GOP aide confirmed the vote will happen Thursday, although a precise time was not locked in by Wednesday afternoon.

Lawmakers opposed to Trump’s use of the emergency declaration seem unable to meet the two-thirds majority vote in either chamber to overturn his veto, but a big vote in the Senate would at least put opponents in striking range.

Tillis and Lee were in talks with Vice President Pence on Tuesday to try to find a compromise that would allow them to vote against the resolution of disapproval, but those talks collapsed on Wednesday.

“We tried to cut a deal, the president didn’t appear interested,” Lee told The Hill. “I’ll be voting ‘yes.’ ”

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The president called Lee during a lunch meeting of the Senate GOP conference to announce that he would not endorse Lee’s bill to require Congress to approve future emergencies.

Republican senators said Trump’s opposition to reining in his emergency powers effectively blew up any chance of coming up with a strategy to defeat the disapproval resolution.

“ ‘Dandy Don’ Meredith used to sing a song at the end of the game when the result was obvious. It was called turn out the lights, the party’s over. Well, that’s appropriate right now,” Sen. John Kennedy John Neely KennedyMORE (R-La.) told reporters after Trump’s position became known.

“It’s time to vote, everybody knows how they’re going to vote. I don’t think the president’s going to win this one,” he added.

Trump, who is using the emergency declaration to access billions of dollars to build the wall, including $3.6 billion in military construction funds, warned Republicans on Wednesday that defectors are making a political mistake.

“This is a vote on border security and it’s a vote on drugs and trafficking and all of that. And I think most Republican senators fully understand that,” Trump told reporters.

Trump says senators can vote their conscience but should proceed carefully.

“I said use your own discretion. But I think it’s a bad vote if they go against — I think anybody going against border security, drug trafficking, human trafficking, that’s a bad vote,” he said.

Republican senators say there are still some negotiations happening over what time the vote should happen and whether the resolution should be subject to amendments.

“There’s been discussion about potential amendments, and that was part of what was discussed, but there’s no decision made,” said Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas).

Thursday’s vote will be the second time in two days the GOP-controlled Senate has broken with Trump.

The chamber voted Wednesday to withdraw U.S. support for a Saudi-led coalition fighting against Houthi rebels in Yemen’s civil war. It passed a similar resolution in December. That legislation must still pass the House.

Rubio said Wednesday that Trump’s declaration is troubling because it would take away money Congress appropriated for military construction projects.

“It’s money that Congress specifically appropriated for purposes of construction on military facilities. You could make an argument that it’s legal under the statute, but it stretches it and that’s what people are uncomfortable with,” he said.

Rubio said there’s discussion about an alternative resolution sponsored by Alexander and Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) that would limit Trump’s ability to redirect funding to two pockets of money.

Another GOP lawmaker, however, said that proposal has been on the table for days and failed to generate much support in the conference.

“It’s gotten to the point of being absurd,” the senator said of the increasingly frantic efforts to find a way to avoid voting for the disapproval resolution.

Alexander, a Senate institutionalist who is retiring in 2020, has led the criticism of Trump’s action.

He called the emergency declaration “unnecessary, unwise and inconsistent with the U.S. Constitution.”

Alexander and other Republicans say that a future Democratic president could use Trump’s decision to declare a national emergency to tear down the border wall, to close coal plants or to require all Americans to receive health coverage under Medicare instead of from private employers.

Jordain Carney contributed.