Efforts by centrist lawmakers to break away from their party leaders and build a compromise that would end the government shutdown are floundering.

The failure to reach a consensus outside of leadership is another indication that the shutdown won’t end unless a deal is struck by the principals: Speaker Nancy Pelosi Nancy PelosiMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Pelosi must go — the House is in dire need of new leadership MORE (D-Calif.), Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) and President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

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The centrists’ idea was straightforward and simple: Write a letter urging Trump to reopen the government for three weeks and, in that time, negotiate a compromise on border security.

But Trump earlier this week said he rejected a similar idea, and Vice President Pence informed GOP senators the White House opposed the plan.

Senate Republicans say the letter-writing effort wasn’t helped by the fact that Schumer urged House Democrats at a caucus meeting Wednesday to pressure Senate Republicans to sign the letter.

As of Wednesday afternoon, only a handful of Senate Republicans and Democrats had signed the letter to Trump, and it was uncertain whether the missive would even be sent.

Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (D-W.Va.), who has signed the letter and attended bipartisan meetings in hopes of finding a breakthrough, said the goal is to have 20 lawmakers in each conference — Republican and Democratic — sign the letter.

But the effort fell far short of that ambitious goal. One Republican aide said the letter had 10 signatures on Wednesday afternoon, but cautioned the number is in flux.

Sen. Thom Tillis Thomas (Thom) Roland TillisAirline job cuts loom in battleground states Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Republican Senators raise concerns over Oracle-TikTok deal MORE (R-N.C.), a key lawmaker who faces a tough reelection in 2020, said Wednesday afternoon that he would not sign it, expressing doubt it would lead to a positive result.

“My concern is we haven’t — beyond just acknowledging the president’s request — we really haven’t set any parameters,” he said. “Without some sort of agreement in principle on what would be on the table for negotiated settlement, I just don’t see it producing a productive outcome.”

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A draft of the letter asks Trump to join the bipartisan group of senators “in supporting a short-term Continuing Resolution (CR) of three weeks to give Congress time to develop and vote on a broad bipartisan agreement that addresses your request.” The senators pledge “during those three weeks, we will make our best efforts following regular order in the appropriate committees and mark up bipartisan legislation related to your request.”

Tillis, however, said three weeks would not be enough time to hash out a compromise, noting that Congress has debated illegal immigration and border security for years without much progress.

“Twenty-one days around here when you’re in these contentious situations is a very short period of time, particularly on a subject we’ve been debating for 40 years,” Tillis said.

Many Senate Republicans have argued for weeks that they want a clear indication from Democrats that Trump will get more money for border fencing in exchange for reopening the government.

Senate Appropriations Committee Chairman Richard Shelby Richard Craig ShelbySenate GOP eyes early exit Dems discussing government funding bill into February GOP short of votes on Trump's controversial Fed pick MORE (R-Ala.) told reporters that he would not sign the letter and said it “could be tilting at windmills,” although he conceded there’s a slim chance it might “move the Democrats in sitting down with Trump.”

“I think things look a little bleak right now,” he said.

Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), who hosted a few of her fellow Republican centrists in a meeting Wednesday morning to find an end to the shutdown, admitted “it’s been very hard to determine what is the magic elixir here.”

Sen. Jon Tester Jonathan (Jon) TesterPence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Filibuster fight looms if Democrats retake Senate MORE (D-Mont.), another potential swing vote who represents a state Trump won by 20 points in 2016, said Wednesday that he hadn’t yet signed the letter and didn’t seem in a rush to join the effort: “I think what they’re trying to do is get a bipartisan group on. If I’m asked, I’ll sign on to it, but I’m not going to wedge my way in. I’ll let them do their work.”

One reason the organizers of the letter — Sens. Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) and Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Del.) — may not have yet approached Tester is they’re trying to get colleagues to sign the letter in bipartisan pairs.

At the moment, there’s a shortage of GOP support in the face of opposition from Trump, as Tillis’s refusal to sign on shows.

Pelosi and Schumer, meanwhile, feel confident they are winning the public relations battle with Trump.

“An overwhelming majority of Americans think that the government should not be shut down over a wall. Even a substantial number of people who support the wall say don’t shut down the government to get the wall,” Schumer said on the Senate floor.

A CNN poll released Wednesday showed Trump losing support among one of his most reliable constituencies, white Americans who don’t have college degrees.

The poll, conducted by SSRS, showed that only 45 percent of this demographic said they approved of Trump’s job performance, a drop from the 54 percent who said they approved of his job performance in early December, before the shutdown. A Quinnipiac University poll released Tuesday also showed Trump’s approval among white voters without college degrees ticking down slightly since the shutdown started last month. The survey showed Trump’s rating among this group dipping from 56 percent to 53 percent.

Schumer highlighted Trump’s weakening numbers in a meeting with Democratic colleagues last week, according to a senator who participated.

Sen. Sherrod Brown Sherrod Campbell BrownEmboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Ohio), who is considering running for president, warned that if Democrats buckle, “Trump will do this again and again and again and again.”

Manchin on Wednesday said Schumer has neither encouraged nor discouraged the efforts by centrists to find a compromise.

“Not at all. Chuck hasn’t said a word,” he said.

“I’m sure he’s aware of the letter,” Manchin added. “And if he’d been objectionable, I’m sure I would have heard loudly and clearly.”

Jordain Carney contributed.