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 is pressing Republican senators in a last-ditch effort to win votes against a measure disapproving of his emergency declaration to build a wall on the Mexican border.

Trump is going to lose the Senate vote later this week, but the White House wants to keep the tally as low as possible and the president is now putting skin in the game trying to sway undecided GOP lawmakers.

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“We talk to a number of members every single day, certainly at the presidential and the staff level, and we’re going to continue to engage with them in this process,” White House press secretary Sarah Huckabee Sanders told reporters Monday.

Senate Majority Whip John Thune John Randolph ThuneSenate GOP sees early Supreme Court vote as political booster shot Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-S.D.) said “the president and the White House and some of our members are still discussing the path forward and hoping we get kind of a resolution.”

A senior Senate Republican aide said the White House is “very involved” in trying to come up with a solution to avoid an embarrassing vote later this week.

Vice President Pence, White House legislative affairs director Shahira Knight and a senior attorney for the Department of Justice are leading the outreach to Senate Republicans, the source said.

The Senate is expected to vote on the measure Thursday, and as many as 15 GOP senators have expressed strong misgivings about Trump stepping on their power of the purse by declaring a national emergency after Congress appropriated only $1.375 billion for border barriers. Even Republican senators who have announced they will support the resolution to block Trump’s national emergency are coming under pressure.

“I am being lobbied on the issue,” said Sen. 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), the first Republican to announce her support for the measure, adding that she’s not going to change her mind. “I came out very, very early on this issue because to me it was such a clear-cut constitutional issue.”

Republicans led by Sens. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (Pa.) and 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.) are trying to craft an alternate resolution that would express support for Trump’s desire to build border barriers while discouraging him or future presidents from declaring national emergencies to circumvent Congress.

No proposal, however, has yet emerged to compete with the main disapproval resolution, and some Republicans question the wisdom of voting on a second measure rebuking Trump’s action that could secure even more GOP votes.

“There’s no consensus on that yet,” 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), a member of the Senate Republican leadership team.

Another Republican lawmaker involved in the talks said “a lot would have to fall in place in a politically charged environment to find a solution,” expressing pessimism about the possibility of a GOP alternative to compete with the disapproval resolution.

Separately, Sens. 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 (R-Utah) and Todd Young Todd Christopher YoungSenate GOP eyes early exit Why the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Ind.) are backing a proposal that would rein in the president’s power to declare a national emergency by requiring Congress to vote on extending such a declaration beyond 30 days.

But Cornyn said any vote on this measure “would be a subsequent legislative matter.”

Trump has stepped up his public pressure on senators, warning they will be seen as weak on border security if they vote with Democrats.

“Republican Senators have a very easy vote this week. It is about Border Security and the Wall (stopping Crime, Drugs etc.), not Constitutionality and Precedent. It is an 80% positive issue. The Dems are 100% United, as usual, on a 20% issue, Open Borders and Crime. Get tough R’s!” he tweeted on Monday.

A large number of Republican defections would generate a spate of negative news stories about Trump losing his grip on the Senate GOP conference and could bolster legal arguments that his action is unconstitutional. This could be the biggest impact of the disapproval vote, as it’s clear the measure doesn’t have enough support in either chamber to overcome a veto. The House passed its disapproval resolution 245-182 behind a united Democratic caucus and 13 Republican defections.

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One Republican swing vote, Sen. 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.), who is concerned about Trump overstepping his constitutional authority, said he’s more likely to vote his conscience since the disapproval resolution won’t survive a veto.

“Whatever you vote, it’s probably going to die somewhere in the process after it leaves here. So I want the vote to be representative of what I believe we need to do,” he said. “It’s all about the signal that you send.”

Isakson said “some people” from the administration have contacted him.

Republican senators are telling the administration that it has enough money to fulfill Trump’s request from last year to spend $5.7 billion on border barriers and doesn’t need to resort to the emergency declaration. But that argument has been undercut by strong Democratic opposition to the White House’s newest budget request for $8.6 billion for border barrier construction in fiscal 2020.

The request includes $5 billion for the Department of Homeland Security and $3.6 billion for the Department of Defense’s military construction fund. It would go toward plans to build barriers along 722 miles of border.

Sen. Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (R-W.Va.), the chairwoman of the Senate Appropriations Subcommittee on Homeland Security, says it will be difficult to get Democrats to agree to any new money for border barriers in this year’s spending bills.

“We’ll have to see. I would just conjecture this reach by the president probably will cloud some of our ability to appropriate on homeland security for the wall,” she said of Trump’s emergency declaration.

Democrats say Trump’s request is a non-starter.

“The recklessness of the Trump budget is underscored by its inclusion of $8.6 billion in border wall funding, an egregious waste of money that does nothing to make our country safer,” said House Appropriations Committee Chairwoman Nita Lowey Nita Sue LoweyTop House Democrats call for watchdog probe into Pompeo's Jerusalem speech With Biden, advocates sense momentum for lifting abortion funding ban Progressives look to flex their muscle in next Congress after primary wins MORE (D-N.Y.).

Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), the Senate Budget Committee’s ranking member who is also running for president, said “we don’t need billions of dollars for a wall that no one wants.”

Sarah Huckabee Sanders pushed back, arguing that Trump’s emergency declaration and budget request are necessary to protect the nation.

“He’s doing what Congress should be doing. He took an oath of office and he has a constitutional duty to protect the people of this country. We have a humanitarian and national security crisis at our border,” she said.

Russell Vought, the acting White House budget director, on Monday dismissed a question about whether Trump might take additional executive action to fund the border wall if Congress fails to provide any more money. One option could be to use emergency defense funds appropriated through the Pentagon’s overseas contingency operations fund.

“Right now we are focused on spending the money that Congress gave us in the last appropriations bill and the money that we have identified as part of declaring a national emergency,” he said.

“This $8.6 billion is geared toward what we would need in addition to complete that wall,” he added.

Niall Stanage contributed.