Their commander is in jail. The authorities are giving them until Friday to clear out and leave. But the United Constitutional Patriots, the right-wing militia under scrutiny over detaining migrant families at the border with Mexico, is digging in.

“It’s my God-given right to be here,” said one balaclava-clad militia member who gave his name only as Viper. Chafing at the hostile reactions to the militia’s actions, he said that he was an Army veteran and that he expected his group, if pushed out, to set up camp in another location along the border.

“The guys in Washington say one thing about not wanting us on the ground, but no one from the Border Patrol here has ever told me they don’t want our help,” he said, squinting under the midday sun. “We’re here to protect Americans from the illegals violating our sovereignty.”

The militia’s encampment Tuesday was little more than a trailer and a few pickup trucks next to a newly installed “No Trespassing” sign. It appeared to reflect the impasse these armed vigilantes now find themselves in: under the magnifying glass of the FBI, cut off from funding, defending their actions to the public and torn asunder by the arrest of their leader, a resident of northwest New Mexico and a three-time felon who went by the alias Johnny Horton Jr. but whose real name is Larry Hopkins.

Tempers were on edge in the camp, which is next to railroad tracks and a dusty road where the existing wall on the border comes to an abrupt end. That is where militia members have been filming their activities, and where, on several occasions, they have confronted and detained groups of migrants who have crossed the border into the United States.

World news in pictures Show all 50 1 /50 World news in pictures World news in pictures 14 September 2020 Japan's Prime Minister Shinzo Abe, Chief Cabinet Secretary Yoshihide Suga, former Defense Minister Shigeru Ishiba and former Foreign Minister Fumio Kishida celebrate after Suga was elected as new head of the ruling party at the Liberal Democratic Party's leadership election in Tokyo Reuters World news in pictures 13 September 2020 A man stands behind a burning barricade during the fifth straight day of protests against police brutality in Bogota AFP via Getty World news in pictures 12 September 2020 Police officers block and detain protesters during an opposition rally to protest the official presidential election results in Minsk, Belarus. Daily protests calling for the authoritarian president's resignation are now in their second month AP World news in pictures 11 September 2020 Members of 'Omnium Cultural' celebrate the 20th 'Festa per la llibertat' ('Fiesta for the freedom') to mark the Day of Catalonia in Barcelona. Omnion Cultural fights for the independence of Catalonia EPA World news in pictures 10 September 2020 The Moria refugee camp, two days after Greece's biggest migrant camp, was destroyed by fire. Thousands of asylum seekers on the island of Lesbos are now homeless AFP via Getty World news in pictures 9 September 2020 Pope Francis takes off his face mask as he arrives by car to hold a limited public audience at the San Damaso courtyard in The Vatican AFP via Getty World news in pictures 8 September 2020 A home is engulfed in flames during the "Creek Fire" in the Tollhouse area of California AFP via Getty World news in pictures 7 September 2020 A couple take photos along a sea wall of the waves brought by Typhoon Haishen in the eastern port city of Sokcho AFP via Getty World news in pictures 6 September 2020 Novak Djokovic and a tournament official tends to a linesperson who was struck with a ball by Djokovic during his match against Pablo Carreno Busta at the US Open USA Today Sports/Reuters World news in pictures 5 September 2020 Protesters confront police at the Shrine of Remembrance in Melbourne, Australia, during an anti-lockdown rally AFP via Getty World news in pictures 4 September 2020 A woman looks on from a rooftop as rescue workers dig through the rubble of a damaged building in Beirut. A search began for possible survivors after a scanner detected a pulse one month after the mega-blast at the adjacent port AFP via Getty World news in pictures 3 September 2020 A full moon next to the Virgen del Panecillo statue in Quito, Ecuador EPA World news in pictures 2 September 2020 A Palestinian woman reacts as Israeli forces demolish her animal shed near Hebron in the Israeli-occupied West Bank Reuters World news in pictures 1 September 2020 Students protest against presidential elections results in Minsk TUT.BY/AFP via Getty World news in pictures 31 August 2020 The pack rides during the 3rd stage of the Tour de France between Nice and Sisteron AFP via Getty World news in pictures 30 August 2020 Law enforcement officers block a street during a rally of opposition supporters protesting against presidential election results in Minsk, Belarus Reuters World news in pictures 29 August 2020 A woman holding a placard reading "Stop Censorship - Yes to the Freedom of Expression" shouts in a megaphone during a protest against the mandatory wearing of face masks in Paris. Masks, which were already compulsory on public transport, in enclosed public spaces, and outdoors in Paris in certain high-congestion areas around tourist sites, were made mandatory outdoors citywide on August 28 to fight the rising coronavirus infections AFP via Getty World news in pictures 28 August 2020 Japanese Prime Minister Shinzo Abe bows to the national flag at the start of a press conference at the prime minister official residence in Tokyo. Abe announced he will resign over health problems, in a bombshell development that kicks off a leadership contest in the world's third-largest economy AFP via Getty World news in pictures 27 August 2020 Residents take cover behind a tree trunk from rubber bullets fired by South African Police Service (SAPS) in Eldorado Park, near Johannesburg, during a protest by community members after a 16-year old boy was reported dead AFP via Getty World news in pictures 26 August 2020 People scatter rose petals on a statue of Mother Teresa marking her 110th birth anniversary in Ahmedabad AFP via Getty World news in pictures 25 August 2020 An aerial view shows beach-goers standing on salt formations in the Dead Sea near Ein Bokeq, Israel Reuters World news in pictures 24 August 2020 Health workers use a fingertip pulse oximeter and check the body temperature of a fisherwoman inside the Dharavi slum during a door-to-door Covid-19 coronavirus screening in Mumbai AFP via Getty World news in pictures 23 August 2020 People carry an idol of the Hindu god Ganesh, the deity of prosperity, to immerse it off the coast of the Arabian sea during the Ganesh Chaturthi festival in Mumbai, India Reuters World news in pictures 22 August 2020 Firefighters watch as flames from the LNU Lightning Complex fires approach a home in Napa County, California AP World news in pictures 21 August 2020 Members of the Israeli security forces arrest a Palestinian demonstrator during a rally to protest against Israel's plan to annex parts of the occupied West Bank AFP via Getty World news in pictures 20 August 2020 A man pushes his bicycle through a deserted road after prohibitory orders were imposed by district officials for a week to contain the spread of the Covid-19 in Kathmandu AFP via Getty World news in pictures 19 August 2020 A car burns while parked at a residence in Vacaville, California. Dozens of fires are burning out of control throughout Northern California as fire resources are spread thin AFP via Getty World news in pictures 18 August 2020 Students use their mobile phones as flashlights at an anti-government rally at Mahidol University in Nakhon Pathom. Thailand has seen near-daily protests in recent weeks by students demanding the resignation of Prime Minister Prayut Chan-O-Cha AFP via Getty World news in pictures 17 August 2020 Members of the Kayapo tribe block the BR163 highway during a protest outside Novo Progresso in Para state, Brazil. Indigenous protesters blocked a major transamazonian highway to protest against the lack of governmental support during the COVID-19 novel coronavirus pandemic and illegal deforestation in and around their territories AFP via Getty World news in pictures 16 August 2020 Lightning forks over the San Francisco-Oakland Bay Bridge as a storm passes over Oakland AP World news in pictures 15 August 2020 Belarus opposition supporters gather near the Pushkinskaya metro station where Alexander Taraikovsky, a 34-year-old protester died on August 10, during their protest rally in central Minsk AFP via Getty World news in pictures 14 August 2020 AlphaTauri's driver Daniil Kvyat takes part in the second practice session at the Circuit de Catalunya in Montmelo near Barcelona ahead of the Spanish F1 Grand Prix AFP via Getty World news in pictures 13 August 2020 Soldiers of the Brazilian Armed Forces during a disinfection of the Christ The Redeemer statue at the Corcovado mountain prior to the opening of the touristic attraction in Rio AFP via Getty World news in pictures 12 August 2020 Young elephant bulls tussle playfully on World Elephant Day at the Amboseli National Park in Kenya AFP via Getty World news in pictures 11 August 2020 French Prime Minister Jean Castex is helped by a member of staff to put a protective suit on prior to his visit at the CHU hospital in Montpellier AFP via Getty World news in pictures 10 August 2020 Locals harvest their potatoes as Mount Sinabung spews volcanic ash in Karo, North Sumatra province, Indonesia Antara Foto/Reuters World news in pictures 9 August 2020 Doves fly over the Peace Statue at Nagasaki Peace Park during the memorial ceremony held for the 75th anniversary of the atomic bombing EPA World news in pictures 8 August 2020 Anti-government protesters try to remove concrete wall that installed by security forces to prevent protesters reaching the Parliament square, during a protest against the political elites and the government after this week's deadly explosion in Beirut AP World news in pictures 7 August 2020 A protester throws a stone towards Israeli forces in the village of Turmus Aya, north of Ramallah in the occupied West Bank, following a march by Palestinians against the building of Israeli settlements AFP via Getty World news in pictures 6 August 2020 A woman yells as soldiers block a road for French President Emmanuel Macron's visit the Gemmayzeh neighborhood. The area in Beirut suffered extensive damage from the explosion at the seaport AP World news in pictures 5 August 2020 Damage at the site of Tuesday's blast in Beirut's port area, Lebanon Reuters World news in pictures 4 August 2020 A large explosion in the Lebanese capital Beirut. The blast, which rattled entire buildings and broke glass, was felt in several parts of the city AFP via Getty World news in pictures 3 August 2020 A general view shows the new road bridge in Genoa, Italy ahead of its official inauguration, after it was rebuilt following its collapse on August 14, 2018 which killed 43 people Reuters World news in pictures 2 August 2020 Empty stall spaces are seen hours before a citywide curfew is introduced in Melbourne, Australia EPA World news in pictures 1 August 2020 People take part in a demonstration by the initiative "Querdenken-711" with the slogan "the end of the pandemic - the day of freedom" to protest against the current measurements to curb the spread of COVID-19 in Berlin, Germany AFP via Getty World news in pictures 31 July 2020 Pilgrims circumambulating around the Kaaba, the holiest shrine in the Grand mosque in Mecca. Muslim pilgrims converged today on Saudi Arabia's Mount Arafat for the climax of this year's hajj, the smallest in modern times and a sharp contrast to the massive crowds of previous years Saudi Ministry of Media/AFP World news in pictures 30 July 2020 The Mars 2020 Perseverance mission lifts off at the Kennedy Space Centre in Florida. The mission is part of the USA's largest moon to Mars exploration. Nasa will attempt to establish a sustained human presence on and around the moon by 2028 through their Artemis programme EPA World news in pictures 29 July 2020 A woman refreshes herself in a outdoor pool in summer temperatures in Ehingen, Germany dpa via AP World news in pictures 28 July 2020 Malaysia's former prime minister Najib Razak speaks to the media after he was found guilty in his corruption trial in Kuala Lumpur AFP via Getty World news in pictures 27 July 2020 North Korean leader Kim Jong Un poses for a photograph after conferring commemorative pistols to leading commanding officers of the armed forces on the 67th anniversary of the "Day of Victory in the Great Fatherland Liberation War". Which marks the signing of the Korean War armistice KCNA via Reuters

These migrants, like others who have crossed the border in recent months, have largely been Central Americans. In sharp contrast to previous inflows of migrants, most of these new arrivals routinely seek to surrender to Border Patrol agents to legally request asylum.

Still, the militiamen and those who support them have seen their work as necessary.

Armando Gonzalez, 52, said he drove to Sunland Park, which sits on New Mexico’s borders with Mexico and Texas, from his home in Tulsa, Oklahoma, to lend a hand to the United Constitutional Patriots. He said he believed that the news media had distorted the group's work and the reality of life along the border.

“If you ask me, this is all about politics,” said Mr Gonzalez, adding that he was a disabled Army veteran with post-traumatic stress disorder. “The Democrats want illegal immigration because that means more votes for them.”

“But I took an oath to protect my country and what’s happening on the border is an invasion threatening our people,” said Mr Gonzalez, who is planning to sleep in his 2001 Chevrolet Suburban. “These men are patriots and I'm proud to stand alongside them.”

Migrants clash with authorities as they seek to cross the US border Show all 23 1 /23 Migrants clash with authorities as they seek to cross the US border Migrants clash with authorities as they seek to cross the US border A group of migrants climb the US border fence in Tijuana AFP/Getty Migrants clash with authorities as they seek to cross the US border A group of migrants cross the dried up Tijuana river AFP/Getty Migrants clash with authorities as they seek to cross the US border Mexico police emerge from a cloud of tear gas Reuters Migrants clash with authorities as they seek to cross the US border Mexico police work to keep migrants from getting over the border with the US AP Migrants clash with authorities as they seek to cross the US border US border patrol agents stand guard as migrant seek to cross the border at Tijuana Reuters Migrants clash with authorities as they seek to cross the US border Adults help a child over the US border fence AFP/Getty Migrants clash with authorities as they seek to cross the US border Migrants near the US border in Tijuana Reuters Migrants clash with authorities as they seek to cross the US border Migrants climb the US border fence in Tijuana AFP/Getty Migrants clash with authorities as they seek to cross the US border Migrants clash with riot police as they near the US border in Tijuana Reuters Migrants clash with authorities as they seek to cross the US border A migrant is detained by US border patrol officers after illegally crossing the border Reuters Migrants clash with authorities as they seek to cross the US border A group of migrants cross the dried up Tijuana river Reuters Migrants clash with authorities as they seek to cross the US border Tear gas is deployed at the border Reuters Migrants clash with authorities as they seek to cross the US border A group of migrants make their way to the US border fence Reuters Migrants clash with authorities as they seek to cross the US border A migrant man wears a homemade gas mask Reuters Migrants clash with authorities as they seek to cross the US border Migrants stand on the banks of the Tijuana river opposite the US border fence Reuters Migrants clash with authorities as they seek to cross the US border A group of migrants cross the Tijuana river Reuters Migrants clash with authorities as they seek to cross the US border Migrants gather at the border crossing in Tijuana AP Migrants clash with authorities as they seek to cross the US border Tear gas is fired by border police to deter migrants EPA Migrants clash with authorities as they seek to cross the US border A migrant covers his face as tear gas surrounds him Reuters Migrants clash with authorities as they seek to cross the US border Migrant families seek to cross the US border at Tijuana Reuters Migrants clash with authorities as they seek to cross the US border Mexico police try to stop migrants from crossing Reuters Migrants clash with authorities as they seek to cross the US border Migrants force their way through the border fence at Tijuana Reuters Migrants clash with authorities as they seek to cross the US border Migrants, part of a caravan of thousands traveling from Central America en route to the United States, run across the Tijuana river to reach the border wall between the U.S. and Mexico in Tijuana, Mexico November 25, 2018. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY Reuters

Mr Gonzalez, who was carrying a 9-millimeter handgun in a holster strapped to his belt, said he considered himself part of the militia. But the two other men at the spartan camp said they didn't think Mr Gonzalez was part of their group.

“He just showed up today,” said the man called Viper.

At one point Tuesday, there were more reporters milling about the camp than militiamen. Some of the journalists broadcast in Spanish to reach viewers on both sides of the border.

Judith Sierra, the owner of Tortilleria Sierra in Sunland Park, chuckled at the thought of armed men travelling to the border to chase after women and children. It’s not uncommon for migrants to pass through her property, she said, lately in large groups.

“We offer them water or tortillas,” she said, adding that the Border Patrol is never far behind.

Armed vigilantes 'illegally' detain hundreds of migrants on US border

“Even with a fence or whatever else, it’s not going to stop people,” said Ms Sierra, who was attending to a steady stream of customers in a black apron dusted with flour. “They’ll come over or under, somehow, they’ll find a way to cross.”

Meanwhile, the authorities in Sunland Park, whose population of about 15,600 is more than 90 per cent Latino, have made it clear that the men in the desert are testing their patience.

The Sunland Park Police Department is evicting the group, telling its members that they want them gone from the camp site by the end of the week. Union Pacific, which operates the railroad near the militia's camp, warned the armed men that they were trespassing to reach their camp.

“These outsiders talk about an invasion when they are the ones invading our peace and quiet,” said Jesus Hernandez, 70, who lives in Sunland Park and works in nearby El Paso, Texas, shining shoes. “I have some advice for them: Get a job and leave us alone."

What's next for the United Constitutional Patriots? Their ranks, while never numerous, seem to be thinning. Hopkins is in jail on a felony weapons charge and Jim Benvie, the group's self-described spokesman, was away from the camp Tuesday.

An older militia member known as "Pops" used vulgar language when a reporter asked him a question, making it clear that he doesn't care for journalists. He also warned against trying to take his picture, telling reporters he didn't want publicity.

Still, officials are increasing scrutiny of the group. Three Democratic members of Congress – Deb Haaland and Ben Ray Luján of New Mexico and Veronica Escobar of Texas – wrote to FBI Director Christopher Wray, requesting an investigation of the United Constitutional Patriots.

“The right to stop and detain should remain reserved for law enforcement,” they said in the letter. “As a nation, we must end this xenophobic behavior.”

Elsewhere in Sunland Park, residents are wondering when the militia will leave. Claudio Alvarado, 69, a retired foreman with the Texas Gas Co, was on a morning walk through his neighbourhood with his two young grandchildren.

Mr Alvarado said that he had lived in the town since he was 12 and that his son-in-law had worked as a Border Patrol agent for a decade. Mr Alvarado made it clear that he doesn’t like the idea of militia members patrolling the border.

“It makes me angry,” Mr Alvarado said, “because that’s not their job.”