WASHINGTON — Nick Fuentes, the chief of a white nationalist group, was bemoaning the political persecution he mentioned he was going through from the federal authorities when he paused throughout a latest livestream to reward one in all his few defenders.

“There may be some hope, possibly, for America First in Congress,” Mr. Fuentes said, referring to the identify of his motion, a gaggle that goals to protect white, Christian identity and culture. “And that’s because of — nearly solely — to Consultant Paul Gosar.”

Mr. Gosar, a five-term Republican and dentist from Prescott, Ariz., emerged this yr as a vociferous backer of the “Cease the Steal” motion that falsely claimed that former President Donald J. Trump won the 2020 election and spearheaded the rally in Washington on Jan. 6 that led to the deadly Capitol riot.

However Mr. Gosar’s ties to racists like Mr. Fuentes and America First, in addition to comparable far-right fringe organizations and activists, have been much less scrutinized. A overview of public feedback and social media posts means that in Mr. Gosar, they’ve discovered an ally and advocate in Congress.

His unapologetic affiliation with them is maybe probably the most vivid instance of the Republican Occasion’s rising acceptance of extremism, which has develop into obvious as extra lawmakers espouse and amplify conspiracy theories and far-right ideologies that determine prominently within the perception techniques of fringe teams.

“The politicians get the assist of the far-right teams which are rising and have gotten extra seen — they get the assist of these constituents,” mentioned Kurt Braddock, a communication professor at American College who research extremism. “What’s important for the teams is that by associating themselves with these politicians — sitting members of Congress — they get a stage of legitimacy that they wouldn’t have gotten in any other case.”

Consultant Matt Gaetz of Florida appeared at an occasion final yr the place safety was dealt with by the Proud Boys, a far-right militia with greater than a dozen members who have been charged within the Capitol riot. Consultant Lauren Boebert of Colorado has come beneath scrutiny for her ties to members of the Three Percenters, a radical militia group.

And earlier than she was elected to Congress, Consultant Marjorie Taylor Greene of Georgia endorsed executing Democratic lawmakers, together with Speaker Nancy Pelosi. She was additionally an adherent of QAnon, the pro-Trump conspiracy movement that holds {that a} corrupt cabal of Democrats, international elites and profession authorities staff who run a Devil-worshiping little one sex-trafficking ring will quickly be rounded up and punished for his or her misdeeds, and that Mr. Trump can be restored to the presidency. (Ms. Greene has since mentioned she doesn’t observe QAnon.)

Mr. Gosar has appeared at rallies throughout the nation referring to President Biden as a “fraudulent usurper,” and known as efforts to seat him “sedition” and a “coup.” Final week, Mr. Gosar got here beneath scrutiny after a social media channel related to Mr. Fuentes advertised an upcoming fund-raiser that includes each males. And in a recent fund-raising solicitation, he unfold a groundless conspiracy principle that the F.B.I. could have been behind the Jan. 6 assault.

The statements and actions haven’t resulted in any punishment from Home Republican leaders, who’ve largely declined to publicly reprimand these of their convention who espouse fringe beliefs or peddle misinformation. Consultant Kevin McCarthy of California, the minority chief, told The Washington Post final week that Mr. Gosar had informed him that the marketed fund-raiser was “not actual.” A spokesman for Mr. McCarthy didn’t reply to questions on Mr. Gosar’s ties to Mr. Fuentes.

In distinction, Mr. McCarthy moved rapidly to attempt to silence probably the most outspoken Republican critic of Mr. Trump: He purged Representative Liz Cheney of Wyoming from her management publish for talking out in regards to the lies that fueled the Capitol riot and advised that she might lose her committee assignments for becoming a member of Democrats in investigating it.

Mr. Fuentes, a 22-year-old white nationalist, on-line provocateur and activist who leads the America First motion, boasts the form of résumé that almost all members of Congress would run from. Having marched at each the Unite the Right rally in Charlottesville, Va., in 2017 and outdoors the U.S. Capitol on Jan. 6, he has warned that the nation is shedding “its white demographic core.” Different conservative organizations have denounced him as a Holocaust denier and a racist.

Mr. Gosar has continued to affiliate with him.

The Arizona Republican was the keynote speaker at a convention hosted by Mr. Fuentes’s group in February, the one member of Congress to take part. Mr. Gosar has unfold America First’s motto and initiatives on Twitter and written to the F.B.I. on congressional letterhead in Mr. Fuentes’s protection. In return, Mr. Fuentes has praised the congressman on his present and social media channels and urged his followers to donate cash to his marketing campaign.

Mr. Gosar’s workplace didn’t reply to detailed questions on his ties to America First and different fringe teams.

First elected to Congress in 2010 as a strident conservative, Mr. Gosar has beforehand espoused conspiracies, cultivating a hard-right on-line base because of this. In an interview earlier than he was elected, he declined to say whether or not he believed President Barack Obama was an American citizen. He falsely suggested in 2017 that the lethal far-right rally in Charlottesville was deliberate by liberals and funded by George Soros. Extra not too long ago, he has questioned whether federal law enforcement officials planted brokers in far-right teams that stormed the Capitol.

Mr. Gosar drew nationwide consideration in 2018, when six of his nine siblings endorsed his opponent, warning that his more and more extremist views made him unfit for workplace. However he has seldom drawn severe challengers in his deeply conservative district and ceaselessly coasts to re-election, together with final yr, when he won nearly 70 percent of the vote.

Nonetheless, whilst he has grown extra outspoken about his perception in fringe theories, Mr. Gosar has averted mimicking the form of explicitly racist language utilized by Mr. Fuentes — feedback of the type that sunk Steve King, a Republican former congressman from Iowa whose racist statements resulted in his removal from congressional committees, earned him rebukes from his personal social gathering and in the end cost him his seat.

In an announcement posted on Twitter final week responding to a wave of shock in regards to the marketed fund-raiser with Mr. Fuentes, Mr. Gosar sought to deflect the criticism by alluding to the charge by conservatives that beneath Mr. Biden — who has spoken out in opposition to systemic racism in the USA — the nation’s establishments have gotten hostile to white individuals.

“Simply as racial supremacy has no place in America First, it has no place in our army, our faculties or boardrooms,” Mr. Gosar wrote.

He denied that Mr. Fuentes’s group included “racial supremacists” and wrote that he was “Undecided why anybody is freaking out.”

“There are tens of millions of Gen Z, Y and X conservatives,” Mr. Gosar wrote. “They consider in America First. They won’t agree 100% on each concern. No group does. We is not going to let the left dictate our technique, alliances and efforts.”

In February, showing at Mr. Fuentes’s America First convention in Orlando because the keynote speaker, Mr. Gosar centered his remarks on immigration and censorship on social media. The remainder of the occasion took a decidedly much less restrained tone.

Mr. Fuentes warned that the nation could be misplaced if it “ceases to retain that English cultural framework and the affect of European civilization.” He confirmed a hype video that includes footage of the Capitol revolt, then praised what he known as the “lots of of hundreds of patriots” who stormed the constructing.

Different audio system included Mr. King, whose introduction video highlighted his previous remarks that “we are able to’t restore civilization with any individual else’s infants,” and Michelle Malkin, a hard-right commentator, who spoke of “our endangered homeland” and the necessity to “destroy globalist phonies on the left and the proper who’re decimating our previous.”

Along with touchdown his motion the imprimatur of a sitting member of Congress, Mr. Fuentes has gained a strong defender. In Could, the Arizona Republican wrote to the F.B.I. on his official letterhead accusing the company of abusing its energy to relegate people to the no-fly listing, singling out Mr. Fuentes and claiming that different “constitutionalists” and “patriots” have been additionally being unfairly focused.

Mr. Fuentes mentioned that Mr. Gosar had been the one Republican lawmaker prepared to take action.

“Virtually no one from the Republican Occasion had something to say about it or felt concern,” Mr. Fuentes mentioned on his present, including that his try to satisfy up with Ms. Greene had been rebuffed by her group.

The perimeter is just not an uncommon place for Mr. Gosar. After the Capitol riot, he got here under scrutiny for his ties to Ali Alexander, a far-right activist and conspiracy theorist who emerged as a frontrunner of the “Cease the Steal” motion. Mr. Gosar ceaselessly tagged him in Twitter posts, together with ones urging his followers to “not settle for a coup.”

At a rally in December exterior the Arizona State Capitol at which Mr. Gosar spoke, Mr. Alexander known as the congressman “the spirit animal of this motion.”

“He’s helped out the place he might,” Mr. Alexander mentioned. “He’s provided to name donors. We really had our first D.C. march as a result of he known as me and he mentioned, ‘It’s essential go to the Supreme Courtroom.’ I mentioned, ‘All proper, my captain.’ And that’s what began that.”

In April, in response to an ethics grievance filed in opposition to him by Consultant Pramila Jayapal, Democrat of Washington, Mr. Gosar defended Mr. Alexander, stating that his interactions with the activist had “revealed a religious Catholic” motivated “by an earnest seek for the reality and love of his nation.”

In the same document, Mr. Gosar additionally defended assembly in 2017 with the Oath Keepers, a right-wing militia whose members participated in the Capitol riot. In the course of the assembly, the congressman informed members of the group that the USA was in a civil warfare; “we simply haven’t began taking pictures at one another but.”

Mr. Gosar mentioned he had addressed the Oath Keepers solely as a result of that they had invited him to talk at their assembly. However he added that solely “leftists” thought-about them an extremist group and pointed to their web site, which describes them as “a nonpartisan affiliation of present and previously serving army, police and first responders” who vow to defend the Structure.

Mr. Gosar then nodded to a different false conspiracy theory circulated broadly after Jan. 6: that far-left groups together with Black Lives Matter had been behind it.

“If members of Antifa, B.L.M. or Oath Keepers broke into the Capitol,” he wrote, “they need to be appropriately charged with trespassing, and so forth.”