The activity was overwhelmingly concentrated in the Border Patrol's Del Rio and Rio Grande Valley sectors in south Texas, accounting for more than seven of 10 people who came in families.
In the Rio Grande Valley sector, the "epicentre of the current surge," agents stopped migrants about 78,000 times in July, Shahoulian said, up from 59,380 in June and 51,149 in May.
The US government disclosures came in a court filing hours after immigrant advocacy groups resumed a legal battle to end the government's authority to expel families at the border on grounds it prevents the spread of the coronavirus.
The Centres for Disease Control and Prevention today renewed those emergency powers, known as Title 42 and named for a 1944 public health law. The Homeland Security Department said it would continue to enforce the ban on asylum for single adults and families despite growing pressure from pro-immigration groups that it isn't justified on public health grounds. Unaccompanied children are exempt.
"Title 42 is not an immigration authority, but a public health authority, and its continued use is dictated by CDC and governed by the CDC's analysis of public health factors," the department said in a statement.
The final count for July border arrests isn't expected for several days, but preliminary numbers are usually pretty close. Over the first 29 days of July, authorities encountered a daily average of 6,779 people, including 616 unaccompanied children and 2,583 who came in families, Shahoulian said.
The number of people stopped in families is expected to hit an all-time during the 2021 fiscal year that ends on September 30, Shaoulian said, adding it will likely be higher if courts order that the pandemic-related powers be lifted.
The rising numbers have strained holding facilities, Shahoulian said. The Border Patrol had 17,778 people in custody yesterday, despite a "Covid-19 adjusted capacity" of 4,706. The Rio Grande Valley sector was holding 10,002 of them.
The American Civil Liberties Union and other advocacy groups said today that they were ending settlement talks with the Biden administration over their demand to lift the pandemic-related ban on families seeking asylum.
The impasse resumes a legal battle before US District Judge Emmet Sullivan in Washington.
"We are deeply disappointed that the Biden administration has abandoned its promise of fair and humane treatment for families seeking safety, leaving us no choice but to resume litigation," said Neela Chakravartula, managing attorney for the Centre for Gender & Refugee Studies.
Since late March, the ACLU has been working with advocates to choose particularly vulnerable migrants stuck in Mexico for the US government to allow in to seek asylum. ACLU attorney Lee Gelernt said the exemptions will continue for another week.
"Seven months of waiting for the Biden administration to end Title 42 is more than enough," Gelernt said.
The breakdown reflects growing tensions between advocates and the administration overuse of expulsions and the government's decision last week to resume fast-track deportation flights for families to Guatemala, El Salvador and Honduras.
Last week, the International Rescue Committee and HIAS also said they were ending efforts to help the administration choose asylum-seekers to exempt from the pandemic-related ban. The asylum advocacy groups had been working on a parallel track with the ACLU to identify particularly vulnerable migrants stuck in Mexico.
The CDC said today that the ban would remain until its director "determines that the danger of further introduction of Covid-19 into the United States from covered non-citizens has ceased to be a serious danger to the public health."
