Romney to vote against Trump's emergency declaration

Sen. Mitt RomneyWillard (Mitt) Mitt RomneyTrump's attacks on McCain exacerbate tensions with Senate GOP Lou Dobbs criticizes Republicans 'undercutting' Trump on 'nasty remarks about John McCain' GOP senator: Trump's criticism of McCain 'deplorable' MORE (R-Utah) said on Thursday that he will oppose President TrumpDonald John TrumpSenate GOP budget ignores Trump, cuts defense Trump says he'll nominate Stephen Moore to Fed White House: ISIS territory in Syria has been 100 percent eliminated MORE's emergency declaration to build the U.S.-Mexico border wall.

"I will vote today for the resolution of disapproval. This is a vote for the Constitution and for the balance of powers that is at its core," Romney said in a statement.

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Romney is the sixth Republican senator to say he will vote for the resolution of disapproval, which is getting a vote in the Senate later Thursday.

In addition to Romney, Sens. Susan CollinsSusan Margaret CollinsSenate GOP poised to go 'nuclear' on Trump picks Overnight Health Care: CDC pushes for expanding HIV testing, treatment | Dem group launches ads attacking Trump on Medicare, Medicaid cuts | Hospitals, insurers spar over surprise bills | O'Rourke under pressure from left on Medicare for all Dem group launches ads attacking Trump's 'hypocrisy on Medicare and Medicaid cuts' MORE (R-Maine), Lisa MurkowskiLisa Ann MurkowskiRed dresses displayed around American Indian museum to memorialize missing, murdered native women Juan Williams: Don't rule out impeaching Trump The 25 Republicans who defied Trump on emergency declaration MORE (R-Alaska), Thom TillisThomas (Thom) Roland TillisOvernight Health Care: CDC pushes for expanding HIV testing, treatment | Dem group launches ads attacking Trump on Medicare, Medicaid cuts | Hospitals, insurers spar over surprise bills | O'Rourke under pressure from left on Medicare for all Dem group launches ads attacking Trump's 'hypocrisy on Medicare and Medicaid cuts' Trump keeps tight grip on GOP MORE (R-N.C.), Mike LeeMichael (Mike) Shumway LeeStop asking parents to sacrifice Social Security benefits for paid family leave The Hill's 12:30 Report: Trump hits media over New Zealand coverage GOP moves to rein in president's emergency powers MORE (R-Utah) and Rand PaulRandal (Rand) Howard PaulTransparency advocate says government agencies face 'use it or lose it' spending Republicans need solutions on environment too Trio of NFL players intern on Capitol Hill as part of league program MORE (R-Ky.) had already announced they would support the resolution. Shortly after Romney made his announcement, Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderGOP eager to exploit Dem court-packing fight Overnight Health Care: Senators seek CBO input on preventing surprise medical bills | Oversight panel seeks OxyContin documents | Pharmacy middlemen to testify on prices | Watchdog warns air ambulances can put patients at 'financial risk' Trump signs executive order on campus free speech MORE (R-Tenn.) became the seventh Republican to say they will vote to block Trump's declaration.

Underscoring the quagmire Republicans have tried to navigate on Trump's emergency declaration, Romney stressed that he supported Trump on border security but had concerns that his emergency declaration would set a precedent for a future Democratic president.

"I am seriously concerned that overreach by the executive branch is an invitation for further expansion and abuse by future presidents. ... Where Congress has enacted a specific policy to consent to an emergency declaration would be both inconsistent with my beliefs and contrary to my oath to defend the Constitution," Romney added.

With all 47 Democrats expected to support the resolution of disapproval, it has the votes to pass the Senate and force a showdown with Trump, who has pledged he will veto it.

Trump made a series of eleventh-hour pleas to Republicans to vote against the resolution of disapproval, ranging from being open to amending emergency powers in the future to warning they were siding with Speaker Nancy PelosiNancy Patricia D'Alesandro PelosiThe Hill's Morning Report — Washington readies for Mueller end game Dem divisions deepen over approach to climate change 2020 Dems avoid this year's AIPAC conference MORE (D-Calif.).

"Prominent legal scholars agree that our actions to address the National Emergency at the Southern Border and to protect the American people are both CONSTITUTIONAL and EXPRESSLY authorized by Congress," Trump said in a tweet Thursday morning.

He pivoted in a subsequent post, adding: "A vote for today’s resolution by Republican Senators is a vote for Nancy Pelosi, Crime, and the Open Border Democrats!"

— This report was updated at 11:16 a.m.