The National Guard troops that President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE sent to the U.S.–Mexico border in April are performing menial tasks to assist U.S. Border Patrol.

A soldier told Politico on Thursday that they have been feeding Border Patrol's horses and shoveling manure.

Sgt. Jonathan Sanchez, a cook, told the outlet that he often does maintenance on Border Patrol’s vehicles.

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“We fix flats,” Sanchez said.

Other tasks include clearing out vegetation, repairing Border Patrol facilities, working as office clerks or operating a complex network of security and remote camera systems.

“Most have never run a surveillance system like this,” Staff Sgt. Thomas Cider told Politico.

Trump signed an executive memorandum in April directing Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE to bolster the Department of Homeland Security’s effort to combat “a drastic surge of illegal activity on the southern border.”

In May, the Pentagon approved an additional request from DHS to send more than 700 National Guard troops to assist Border Patrol. They joined the 1,100 members already stationed along the Southern border.

Mattis approved as many as 4,000 troops to be deployed to the border, none of which are armed.

According to Politico, the troops are kept at a safer distance than previous troops.

In order to keep them safe, National Guard troops are not permitted to patrol or participate in detainment operations for migrants crossing the border, officials told the outlet.

Late last month, the president of the labor union representing Border Patrol agents criticized Trump's deployment, calling it a “colossal waste of resources.”

Brandon Judd, president of the National Border Patrol Council, said last month that they have “seen no benefit” from the National Guard presence.