"While the soldiers were parked south of the border fence near Clint, Texas, they were north of the Rio Grande riverbed, which placed them 'appropriately in USA territory, ' according to Maj". Agents have been attempting to reach his family.
However, smuggling individual migrants under cover of darkness is a stark contrast to the bold, en masse incursions Border Patrol agents have dealt with recently, after the migrants realized the agents have no capability to keep everyone in detention facilities and have no other choice but to release migrants to the community while they await hearings in immigration courts.
Irma Chapa, communications director for the Border Patrol's Rio Grande Valley Sector, said agents responded Tuesday morning to a group of migrants who had crossed the Rio Grande.
According to a Government Accountability Office report released earlier this year, Border Patrol employees consist of 19,443 agents as of February 2019, almost 7,000 below the target level of 26,370.
Central American migrants rest near the railroad tracks during their journey toward the US-Mexico border in Chahuites, Oaxaca state, Mexico.
He was taken to Fort Brown border station, where he was supervised by agents while efforts were made to find his family, officials say. "Mexico is not doing almost enough in apprehending & returning!" he added.
It also comes amid a surge in illegal immigrants in the last 12-years.
He warned: "The Mexican government is powerless to control the cartels at our border".
Trump has several times threatened to close the southern border with Mexico. Agency officials said this month that from April 2018 through most of March, the Border Patrol identified more than 3,100 parents and children whom it accused of making "fraudulent claims".
The confrontation between Mexican and US troops occurred April 13 on American territory.
He said Wednesday at an event in Atlanta that "Mexico is starting to detain" and send people "back to their country, where they came from", but said too many drugs are still coming across the border. Mexico has also reportedly stepped up arrests and deportations - just not enough to satisfy President Trump.
His plans reached an impasse a year ago after Congress refused to give Mr Trump the $5.7bn (£4.5bn) he wanted to build the wall, leading to a government shutdown.