When former Representative Tony Gonzales, Republican of Texas, admitted in March to a long-rumored affair with a staff member who later killed herself, a pair of Republican women immediately called for him to be formally censured, and a third became the first in the G.O.P. to demand that he resign.

The men at the helm of the party, President Trump and top Republican congressional leaders, were still standing by Mr. Gonzales, whose vote they needed to maintain their narrow majority in the House.

But among the small minority of G.O.P. lawmakers in the House who are women, an outspoken trio on the hard right — Representatives Anna Paulina Luna of Florida, Nancy Mace of South Carolina and Lauren Boebert of Colorado — went on the war path and ultimately helped force Mr. Gonzales’s resignation in May under the threat of expulsion.

It was part of an unlikely campaign by three MAGA women to call out what they say is a culture of rampant sexual harassment and misconduct on Capitol Hill, and to dismantle the unwritten rules of political expediency and tribal loyalty that for decades have helped to keep such behavior under wraps.

“His staffer lit herself on fire and killed herself in the worst possible way, and he got a hall pass?” Ms. Mace said on Wednesday during a lengthy group interview with Ms. Boebert and Ms. Luna, who shared a couch across from her, to discuss their efforts. “I don’t think so.”

The three lawmakers, all of whom have notably said they do not believe the allegations of sexual abuse and misconduct against Mr. Trump, added that they were bent on naming and shaming predators in Congress in both parties.

“This place only operates on pressure and pain,” said Ms. Luna, who led the charge to push out Mr. Gonzales. “The best way to change it is with pressure and pain.”

“Group” is an unusual word for these independent rabble rousers who have proven to be more successful at generating headlines about their own antics than at building alliances. But the women — who began to refer to themselves during the interview as the “three musketeers” — have forged a small caucus that has had an impact in recent months on how men accused of sexual wrongdoing have been treated by Congress.

Ms. Mace and Ms. Boebert, along with former Representative Marjorie Taylor Greene of Georgia, also withstood immense pressure earlier this year from Mr. Trump when they signed on to a petition that forced the release of the files related to Jeffrey Epstein, the disgraced financier and convicted sex offender.

“It’s not easy having the president come down on you,” Ms. Boebert said.

Still, they said that they saw nothing wrong with the behavior of the president — who was found liable of sexual abuse in 2023 and was caught on tape boasting about pushing himself on women — and dismissed the accusations of sexual misconduct against him.

“I’ve only ever gotten grandfather vibes,” Ms. Boebert said of Mr. Trump.

They are far less forgiving of their colleagues on Capitol Hill.

All three have demanded the release of documents detailing any sexual harassment settlements reached by members of Congress. On the Oversight Committee, Ms. Mace crossed party lines last summer to force an inquiry into the Justice Department’s handling of its investigation into Mr. Epstein. Ms. Mace and Ms. Boebert voted with Democrats earlier this year to force a subpoena in that inquiry for Pam Bondi, then the attorney general, to testify.

All three were out front on the charge to expel former Representative Eric Swalwell, Democrat of California, after he was accused of sexually assaulting a former staff member, and of misconduct with other women. Ms. Luna, in particular, coordinated with Democrats on how to file separate resolutions to expel Mr. Swalwell and Mr. Gonzales.

Under pressure, Mr. Swalwell, who denies the charges, chose to resign instead.

“They would have been expelled, so they’d rather leave on their own terms and resign, absolutely,” Ms. Boebert said.

On Tuesday, the women shared a hard-boiled view of how Congress operates, and what it may take to change a work environment where sexual harassment has long been accepted as an unfortunate but unchangeable reality.

Ms. Luna said the recent resignations of two members of Congress had created the first moment of reckoning since the #MeToo movement, which spurred changes in 2018 to the way Congress handled sexual harassment claims. She added that they needed to capitalize on it.

“If you make an example of people, others are less inclined to behave that way,” she said. “That’s why this goes in cycles. This is another cycle, and I think people will be on good behavior until it slides again.”

Ms. Mace added: “There are still members that need to be expelled. We want them scared.”

Next on their list: Representative Cory Mills, Republican of Florida. They said that they did not yet have the votes needed to force him out.

Mr. Mills was investigated by the Metropolitan Police Department in Washington last year in connection with a report of an assault on a woman. His former girlfriend was issued a protective order against him after accusing him of threatening her with revenge porn following their breakup. He has also been under investigation by the House Ethics Committee, and has vehemently denied wrongdoing.

Ms. Mace said she was in discussions with Speaker Mike Johnson about kicking Mr. Mills off committees until he is expelled or resigns, or until the ethics panel finishes its investigation. (A spokesman for Mr. Johnson said the speaker was waiting on the ethics committee to finish its work before taking any punitive action.)

The women said they were happy to be the instigators on an issue that hits home for them. But they also questioned why they had to be the ones to call for predators to leave their positions of power.

“The real question is: Why aren’t people who have been here the longest taking the lead on this issue?” Ms. Luna said. “The answer is: They want to stay. They don’t want to make waves. They hide behind the institution’s process, but the institution’s process is corrupt.”

Ms. Luna was referring to the ethics committee, which is often the first stop for any investigation of harassment claims against lawmakers. But the panel operates in deep secrecy and often takes years to complete its work. In a rare statement last month, it defended its handling of sexual harassment charges but also cited challenges — primarily a reluctance among victims to come forward — that had slowed its work.

In April, Ms. Boebert positioned herself as a resource for staff members who were being mistreated by their bosses or co-workers.

“Come to my office,” she said. “If you want to remain anonymous, remain anonymous. Let one of us loudmouths get it out there for you.”

But she said no one had taken her up on the offer.

“I think people are still afraid,” she said. “They’re afraid to speak up.”

It is hard to imagine any Democratic aide feeling comfortable approaching Ms. Boebert — who has accused Democrats, at various times, of inciting violence, hating Christmas and “grooming” children — with any sensitive personal story.

She is also an incongruous messenger for a call to clean up Congress’s act. She was caught on a security camera in 2023 vaping and groping her date shortly before being ejected from a performance of the musical “Beetlejuice” in a Denver theater. It was an embarrassing chapter that she rode out, apologizing to her constituents and then ultimately embracing the saga with dry humor when she realized she could not shake it. (She even hung up a Beetlejuice poster with her face on it.)

Her two compatriots also have established reputations as troublemakers, and sometimes bullies.

Ms. Mace has publicly tormented Representative Sarah McBride, Democrat of Delaware and the first openly transgender member of Congress, since Ms. McBride took office last year, waging a campaign to bar her from women’s restrooms in the Capitol complex.

Ms. Luna is regarded by many Democrats as a less-than-reliable broker on a host of issues they have tried to work with her on. Most recently, she leveled unsubstantiated and unspecific accusations of sexual harassment against Senator Ruben Gallego, the Arizona Democrat who is considered a potential 2028 presidential candidate and was a close friend of Mr. Swalwell’s.

Ms. Luna said she had turned over materials related to his conduct to the Senate Ethics Committee. In response, Mr. Gallego, who has denied wrongdoing, proactively contacted the committee to meet with its staff.

Mr. Gallego’s spokesman has dismissed Ms. Luna’s efforts as “right-wing conspiracy theories being parroted by a fringe, far-right member of Congress.” Ms. Luna insisted that there are real issues.

Despite the nasty words from Mr. Gallego, the three G.O.P. lawmakers have gained a sliver of respect from some Democrats.

“Nancy Mace and Lauren Boebert showed extraordinary courage on Epstein, and Anna Paulina Luna has been a strong voice for Epstein survivors,” said Representative Ro Khanna, Democrat of California. “They also deserve credit for demanding the release of Congress’s sexual harassment settlements, which I support, and holding members on both sides who have engaged in predatory behavior accountable.”

Some of their interest in the issue is clearly shaped by their own experiences as women working in a male-dominated field.

Ms. Mace, who was raped as a teenager, said that when she served in South Carolina’s state legislature, a male colleague “pulled me onto his lap in the chamber. I had another spank me with a magazine on the butt. Here, I’ve been hit on by my married colleagues.”

Ms. Luna said she had to fire her general counsel once because of comments he had made about her to other members of her staff.

Ms. Boebert said she had no professional “horror stories” to share, but she appeared to harbor deep resentment about the blowup of her own marriage in 2023 — and about how women in politics were expected to credit their spouses with their own success.

“My best friend was a little skank and she ruined my marriage,” Ms. Boebert said, recounting how she discovered the betrayal on the morning of her first general election. “And then you have to go onstage and say, ‘Oh, I couldn’t do it without my husband.’”

Ms. Boebert suggested one potential upgrade to the culture on Capitol Hill that allows men to behave badly with women: Marriage counselors should be available on demand for lawmakers, she said.

“There are prayer groups,” Ms. Luna offered.

“That’s where the men say they’re going, and they’re actually going to have an affair,” Ms. Boebert scoffed.

“There’s a ton of affairs,” Ms. Luna conceded.

Sitting together in Ms. Mace’s office, it was not clear if the women could exactly be described as close friends. Ms. Luna, 36, who has a toddler son, and Ms. Boebert, 39, who has a toddler grandson, have bonded over those children, and have campaigned together. Ms. Mace, 48, who is running for governor in South Carolina, appears to do less socializing outside of work with the other two. But it was clear that they had gained a certain level of comfort and trust with each other on an issue for which their experiences and worldview have them aligned.

Last year, when Ms. Mace gave a speech on the House floor accusing her former fiancé and three other men of having drugged and raped her and other women, Ms. Boebert and Ms. Luna sat behind her in a mostly empty chamber, in a show of solidarity.

“My turning point with my relationship with these two women here was when I gave my speech,” Ms. Mace said. “They were the only ones who gave a damn.”