Congressional Republicans are expressing discomfort with Donald 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’s claims that the election is “rigged” against him.

They fear his assertions will undermine Americans’ faith in the electoral process and the long-standing precedent that candidates accept the legitimacy of voting results.

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Even members of Congress who have endorsed Trump think his accusations of widespread voter fraud go too far.

“If he's saying it's rigged because national media is biased then I agree with him,” a GOP lawmaker who supports Trump told The Hill, requesting anonymity to speak candidly. “If he's saying it's rigged because election officials will commit fraud, then I think he's way off base.”

With nearly every national poll showing Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE ahead of Trump in the race, he is increasingly warning of a conspiracy to steal the election.

Trump has been making the claims as he seeks to recover from the release of a 2005 tape in which he brags about using his celebrity to grope and kiss women without their consent. Since the release of the tape, nearly a dozen women have come forward to accuse him of sexual misconduct.

“Of course there is large scale voter fraud happening on and before Election Day. Why do Republican leaders deny what is going on? So naive!” Trump tweeted on Monday.

“The election is absolutely being rigged by the dishonest and distorted media pushing Crooked Hillary — but also at many polling places — SAD,” he posted a day earlier.

Trump and his running mate, Indiana Gov. Mike Pence Michael (Mike) Richard PenceButtigieg stands in as Pence for Harris's debate practice Trump argues full Supreme Court needed to settle potential election disputes Pence adviser knocks ex-staffer who criticized Trump on COVID-19 MORE, are encouraging supporters to monitor polling stations on Election Day.

Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE (R-Ala.), the first senator to endorse Trump, said during a New Hampshire rally over the weekend that forces against the nominee are “attempting to rig this election," adding, “They will not succeed.”

But among GOP lawmakers, Sessions is alone so far in siding with Trump.

To some Republicans, Trump’s claims of a rigged result are a sign that he is preparing for the likelihood of losing the election.

“I think he’s setting up for, in his own perverse twisted way, having some way of explaining when he goes on all the talk shows after he’s been trounced, of saying, ‘I didn’t lose,’ because he can’t fathom this because he’s a ‘winner,’” Rep. Scott Rigell Edward (Scott) Scott RigellEx-Rep. Scott Taylor to seek old Virginia seat GOP rushes to embrace Trump GOP lawmaker appears in Gary Johnson ad MORE (R-Va.) told The Hill in a Monday interview.

But Rigell warned that stoking doubts about the results could lead Trump’s loyal supporters to view Clinton’s presidency as illegitimate, breaking from the peaceful transitions of power that have been the norm.

Polling suggests Trump’s rhetoric is already influencing voters. A Politico-Morning Consult survey released Monday found that 41 percent of voters think the election could be “stolen” from Trump due to widespread voter fraud.

“There are hundreds of thousands, and perhaps more than that, that will buy what he’s selling,” Rigell said. “It’s cancerous to a republic.”

Rigell, for his part, is retiring from Congress this year and plans to vote for Libertarian nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE instead of the GOP ticket.

“He’s a pathetic individual,” Rigell said of Trump.

Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.), who has said he will no longer defend Trump, issued a statement over the weekend emphasizing his faith in the electoral system.

“Our democracy relies on confidence in election results, and the speaker is fully confident the states will carry out this election with integrity,” Ryan spokeswoman AshLee Strong said.

Trump quickly fired back at Ryan on Twitter, writing, “The Democrats have a corrupt political machine pushing crooked Hillary Clinton. We have Paul Ryan, always fighting the Republican nominee!”

Some GOP leaders are silent on Trump’s claims. Representatives for Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) and House Administration Committee Chairwoman Candice Miller (R-Mich.), whose panel oversees federal elections, didn’t respond to requests for comment.

Neither did a spokeswoman for Rep. Greg Walden (R-Ore.), the chairman of the National Republican Congressional Committee. But one of Walden’s deputies and the front-runner to replace him at the top of the House GOP campaign arm, Rep. Steve Stivers (R-Ohio), dismissed the notion of a rigged election.

"I have full faith in our election system to conduct a fair election," Stivers said. "America leads the world in conducting fair and open elections, and I have no reason to believe this year would be any different."

Rep. Pete King (R-N.Y.), another Trump supporter, rejected the notion that the election would be rigged. He tried to frame Trump’s rhetoric as a way of motivating supporters to the polls on Election Day.

"He wants to make sure that, with all of the talk about Trump not winning, he wants to tell his people, 'Hey, get out there, make sure that we get every last vote out because they're gonna be working against us,’” King said Monday on the ”Imus in the Morning” radio show in a clip posted by CNN’s KFILE.

"Now, whether that's accurate or not, I think his method, or his motive here, is to make sure that every one of his voters does get out there to compensate for any other votes that he feels may be rigged against him,” King said.

Democrats pointed to Al Gore Albert (Al) Arnold GoreCruz says Senate Republicans likely have votes to confirm Trump Supreme Court nominee 4 inconclusive Electoral College results that challenged our democracy Fox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles MORE’s concession of the 2000 election as an example of how candidates should act once the system declares a winner.

"This issue is bigger than any of us and bigger than this election. This is about each of us doing our part to ensure the continued functioning of our democracy. At some point, the good of the country must outweigh the instinct for political self-preservation,” House Minority Leader Nancy Pelosi (D-Calif.) and Senate Minority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.) said in a joint statement on Monday.

Election experts say rigging the vote would be difficult due to the decentralized system that relies on thousands of state and local officials. One investigation by a Loyola Law School professor found only 31 cases of voter fraud out of more than a billion votes cast.

Scott Wong contributed.