Few House Republicans appear ready to defy 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 by backing a resolution that would stop his emergency declaration to build a wall on the Mexican border.

As Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) tees up a floor vote on a resolution to block Trump's unilateral move, most Republicans are set to line up in defense of their White House ally — despite some publicly voiced concerns about his action.

The reasons are both practical and political.

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With Democrats in control of the lower chamber, Republicans are powerless to block the disapproval resolution, which Rep. Joaquin Castro (D-Texas) introduced in the House on Friday morning.

Perhaps more importantly, polls indicate that Trump’s declaration enjoys the overwhelming support of Republican voters, leaving GOP lawmakers no cover to buck the president — particular on his signature issue of border security.

If some have lingering reservations about the move’s legality — or the possibility Trump could use dollars headed toward their districts to construct the wall — there’s little sense they want to invite a primary challenge next year.

“As long as Trump’s popularity with Republican voters remains in the high 80s to low 90s, it’s hard to see how the political laws of nature will change,” said Doug Heye, a former House GOP leadership aide and former spokesman at the Republican National Committee.

Case in point: Rep. Roger Williams John (Roger) Roger WilliamsThe Hill's 12:30 Report - Presented by Facebook - Yoho apologizes for accosting AOC Ocasio-Cortez accosted by GOP lawmaker over remarks: 'That kind of confrontation hasn't ever happened to me' Cook shifts 20 House districts toward Democrats MORE. At a town hall this week, the Texas Republican was asked by a constituent if he supported Trump’s emergency declaration.

“No,” he replied to applause in the room, according to the Austin American-Statesman. Williams said he feared Trump’s wall strategy — which taps $3.6 billion earmarked for military construction projects — could steal federal funds away from Fort Hood in his central Texas district.

His response triggered a wave of headlines highlighting Williams’s opposition to Trump; Democrats pointed to Williams as evidence that even his usual supporters believed the president had gone too far. But just hours after his appearance in Bee Cave, Texas, the congressman posted a series of tweets making absolutely clear that he was in Trump’s corner and would not be joining the Democrats in their resolution of disapproval.

Trump took executive action, Williams argued, because Congress failed to adequately secure the border. And he said acting Defense Secretary Patrick Shanahan Patrick Michael ShanahanHouse Armed Services chairman expresses confidence in Esper amid aircraft carrier coronavirus crisis Boeing pleads for bailout under weight of coronavirus, 737 fallout Esper's chief of staff to depart at end of January MORE had assuaged some of his concerns by pledging that military housing money would not be touched by the Trump administration.

“I fully support @POTUS’ efforts to secure the border — including using an emergency declaration — following the clear intentions of the Democrats to simply kick the can down the road and play politics with the safety of Americans,” Williams tweeted.

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Earlier this month, five House Republicans with military bases in their backyards — Rep. Richard Hudson Richard Lane HudsonHow Congress is preventing a Medicare bankruptcy during COVID-19 Cook shifts 20 House districts toward Democrats American meat producers must leverage new technology to protect consumers, workers MORE (N.C.), Tom Cole Thomas (Tom) Jeffrey ColeBottom line House approves .3 trillion spending package for 2021 Multiple lawmakers self-quarantine after exposure to Gohmert MORE (Okla.), Mike Turner Michael Ray TurnerHispanic Caucus campaign arm endorses slate of non-Hispanic candidates Overnight Defense: Trump announces 'snapback' of sanctions on Iran | Uniformed personnel at Dem convention under investigation | Netanyahu calls reported F-35 deal 'fake news' Democrats go big on diversity with new House recruits MORE (Ohio), Doug Lamborn Douglas (Doug) LambornIran must free Pastor Youcef Nadarkhani House GOP urge Trump against supporting additional funding for state and local governments House GOP lawmakers urge Senate to confirm Vought MORE (Colo.) and Chris Collins Christopher (Chris) Carl CollinsConspicuous by their absence from the Republican Convention NY Republican Chris Jacobs wins special election to replace Chris Collins 5 things to watch in Tuesday's primaries MORE (N.Y.) — sent a joint letter pleading with Trump not to use previously allocated military-construction funds to build his wall. But none have pledged to sign onto the Democratic resolution.

Former Armed Services Chairman Mac Thornberry William (Mac) McClellan ThornberryTrump payroll-tax deferral for federal workers sparks backlash Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq Top Armed Services Republican 'dismayed' at Trump comments on military leaders MORE (R-Texas) has also been apprehensive about Trump's plan to “reprogram” military funding to build his long sought border wall. Such a shift, he warned, “would have detrimental consequences for our troops.”

Yet Thornberry, too, is placing much of the blame on the Democrats, accusing them of “stonewalling” on wall funding for political ends — a signal that he’s hardly prepared to endorse a formal rebuke of the president.

Even Rep. Will Hurd William Ballard HurdHillicon Valley: Oracle confirms deal with TikTok to be 'trusted technology provider' | QAnon spreads across globe, shadowing COVID-19 | VA hit by data breach impacting 46,000 veterans House approves bill to secure internet-connected federal devices against cyber threats House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (R-Texas), a border-district immigration reformer who’s warning that Trump’s declaration “sets a terrible precedent,” is dodging questions about whether he’ll support the disapproval resolution.

“I'm always open to making sure that Congress takes back some of this power as a coequal branch of government,” he told CBS’s “Face the Nation” Sunday. “And I'm sure there's going to be a lot of conversations.”

Across the Capitol, the dynamics are different. Senators represent entire states, not smaller districts gerrymandered into partisan enclaves. And there’s plenty of pressure on some GOP senators to support the disapproval resolution when it’s sent over by the House.

The Hill identified 10 GOP senators who could break with Trump on the issue, including Sens. 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.), Cory Gardner Cory Scott GardnerOvernight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution 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 (Colo.) and 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).

But it’s far from clear the measure stopping Trump’s emergency declaration will clear the Senate.

So far, the only Republican in Congress vowing to join Democrats is centrist 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 of Maine. She is expected to face a tough reelection in 2020 and has said she both supports a lawsuit challenging the president’s action and will vote for the Democratic-led resolution.

The disapproval resolution is deemed “privileged” under the National Emergencies Act of 1976, which both guarantees a vote in the Senate and precludes opponents from blocking it with a filibuster. That means Senate Democrats, who are expected to stand together, will need to win support from at least three additional Republicans to send the resolution to Trump, who has vowed a swift veto. Neither chamber is expected to reach the two-thirds majority threshold to override a veto.

Following Pelosi’s lead, Senate Minority Leader Chuck Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) said Thursday that his caucus will soon roll out an identical companion resolution to the House legislation to stop Trump.

“This issue transcends partisan politics, and I urge all senators — Democrats and Republicans — to support this resolution to terminate the president’s emergency declaration when it comes up for a vote in the Senate,” Schumer said Thursday.

Announced last Friday, Trump’s emergency declaration came after a months-long budget standoff over the president’s demand for $5.7 billion for new wall construction — a non-starter for Democrats. The impasse led to a five-week government closure, the longest in the country’s history, and GOP leaders — hoping to avoid another damaging shutdown — pressured Trump last week to sign a spending package without the wall funding.

The emergency order was Trump’s way to work around Congress, empowering the president to build the wall using funds from other programs. Aside from the $3.6 billion in military construction projects, he also intends to use $601 million from the Treasury Department’s Asset Forfeiture program and $2.5 billion from an anti-drug program under the Pentagon.

Some of the Republican critics joined Democrats in deriding the unilateral move as simply unconstitutional, as Congress has sole power to direct where taxpayer dollars are spent.

Rep. Justin Amash Justin AmashCentrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon MORE (R-Mich.) has been especially vocal in condemning Trump’s action. Not only is there no emergency, Amash argues, but Trump is overstating the powers lent him by the National Emergencies Act.

“A prerequisite for declaring an emergency is that the situation requires immediate action and Congress does not have an opportunity to act,” he tweeted. “@POTUS @realDonaldTrump is attempting to circumvent our constitutional system.”

Amash frequently breaks with his party on thorny questions related to constitutional powers. He has not said how he’ll vote on Castro’s disapproval resolution.

This story was updated at 9:37 a.m.