Romney to vote against Trump's emergency declaration

Sen. Mitt RomneyWillard (Mitt) Mitt RomneyRomney: Trump asking Ukraine to investigate political rival 'would be troubling in the extreme' Bolton replacement inherits tough challenges — including Trump Bipartisan group of senators urges FDA to pull most e-cigarettes immediately MORE (R-Utah) said on Thursday that he will oppose President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' 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 CollinsTrump judicial picks face rare GOP opposition GOP signals unease with Barr's gun plan Sinema touts bipartisan record as Arizona Democrats plan censure vote MORE (R-Maine), Lisa MurkowskiLisa Ann MurkowskiOvernight Health Care — Presented by Partnership for America's Health Care Future — Walmart to stop selling e-cigarettes | Senators press FDA to pull most e-cigarettes immediately | House panel tees up e-cig hearing for next week Bipartisan group of senators urges FDA to pull most e-cigarettes immediately Sinema touts bipartisan record as Arizona Democrats plan censure vote MORE (R-Alaska), Thom TillisThomas (Thom) Roland TillisThe Hill's Campaign Report: De Blasio drops out | Warren gains support from black voters | Sanders retools campaign team | Warning signs for Tillis in NC The Hill's Morning Report — Trump's new controversy Warning signs flash for Tillis in North Carolina MORE (R-N.C.), Mike LeeMichael (Mike) Shumway LeeZuckerberg woos Washington critics during visit Zuckerberg to meet with lawmakers to discuss 'future internet regulation' Hillicon Valley: Election security looms over funding talks | Antitrust enforcers in turf war | Facebook details new oversight board | Apple fights EU tax bill MORE (R-Utah) and Rand PaulRandal (Rand) Howard PaulOn The Money: House votes to avert shutdown, fund government through November | Judge blocks California law requiring Trump tax returns | Senate panel approves three spending bills Paul objection snags confirmation of former McConnell staffer Defense bill talks set to start amid wall fight MORE (R-Ky.) had already announced they would support the resolution. Shortly after Romney made his announcement, Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderDemocrats hit Scalia over LGBTQ rights Here are the lawmakers who aren't seeking reelection in 2020 EXCLUSIVE: Swing-state voters oppose 'surprise' medical bill legislation, Trump pollster warns 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 PelosiRomney: Trump asking Ukraine to investigate political rival 'would be troubling in the extreme' Pelosi: Whistleblower complaint 'must be addressed immediately' Democrats must embrace Israel and denounce anti-Semitism in the party 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.