Romney to vote against Trump's emergency declaration

Sen. Mitt RomneyWillard (Mitt) Mitt RomneyLobbying World Republicans wary of US action on Iran The Hill's Morning Report - Trump takes 2020 roadshow to New Mexico MORE (R-Utah) said on Thursday that he will oppose President TrumpDonald John TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border 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 CollinsThe Hill's Morning Report - Trump takes 2020 roadshow to New Mexico The 13 Republicans needed to pass gun-control legislation Congress passes bill to begin scenic byways renaissance MORE (R-Maine), Lisa MurkowskiLisa Ann MurkowskiKavanaugh impeachment push hits Capitol buzz saw McConnell lashes out at Democrats over 'unhinged' criticism of Kavanaugh The 13 Republicans needed to pass gun-control legislation MORE (R-Alaska), Thom TillisThomas (Thom) Roland TillisKavanaugh impeachment push hits Capitol buzz saw The 13 Republicans needed to pass gun-control legislation Bolton returns to political group after exiting administration MORE (R-N.C.), Mike LeeMichael (Mike) Shumway LeeHillicon Valley: Election security looms over funding talks | Antitrust enforcers in turf war | Facebook details new oversight board | Apple fights EU tax bill Antitrust enforcers in turf war over Big Tech Exclusive: Kushner tells GOP it needs to unify behind immigration plan MORE (R-Utah) and Rand PaulRandal (Rand) Howard PaulRepublicans wary of US action on Iran EXCLUSIVE: Swing-state voters oppose 'surprise' medical bill legislation, Trump pollster warns Rand Paul: Almost every mass shooter 'is sending off signals' MORE (R-Ky.) had already announced they would support the resolution. Shortly after Romney made his announcement, Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderHere are the lawmakers who aren't seeking reelection in 2020 EXCLUSIVE: Swing-state voters oppose 'surprise' medical bill legislation, Trump pollster warns The 13 Republicans needed to pass gun-control legislation 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 PelosiPelosi: Democrats will 'certainly' beat Trump in 2020 Kavanaugh impeachment push hits Capitol buzz saw Lewandowski, Democrats tangle at testy hearing 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.