A former soldier who served two tours in Afghanistan with the US military and where he suffered serious head injuries, is fighting an order to deport him to Mexico.

Military veteran Army Private 1st class Miguel Perez was born in Mexico and grew up in Chicago. He sustained a brain injury on his second tour of duty and suffers from post-traumatic stress disorder, his family said.

But now, Mr Perez faces being sent to Mexico. Four years he left the military, Mr Perez served prison time for a drug offence which sparked the deportation proceedings. Mr Perez, 38, was a legal permanent resident when he joined the army and said he thought he became a legal US citizen when he enlisted, but that was not the case.

Family, friends and supporters have urged the courts to allow Mr Perez to stay (Facebook)

Mr Perez is one of thousands of green card veterans who face deportation, according to the Ashley’s Memory Project, which was started by the immigrant mother of a deceased veteran, and a local church. They said many enlist with the promise of citizenship.

“He’s more American than most of us standing here, because he did pick up arms to defend this country,” his mother, Esperanza Perez, told reporters at Lincoln United Methodist Church in the city’s Pilsen neighbourhood.

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Mr Perez’s family has claimed that the former soldier did not did not get adequate medical attention when he returned home and turned to self medication with drugs and alcohol.

The Chicago Tribune said that a judge is weighing up the case and will issue a written response in weeks. Immigration judge Robin Rosche, is considering Mr Perez’s claim under the United Nations Convention against Torture, a protection that resembles asylum.

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Under that provision, the US agrees not to deport people who are not American citizens or nationals to another country where they could be tortured. Mr Perez told the judge that he fears for his life if he is sent back to Mexico.

His lawyer, Chris Bergin, said Mr Perez and other veterans who have been sent back to Mexico are targeted.

“Those kind of people are immediately targeted upon entry to Mexico as people who can help criminal gangs, cartels, through their military experience, their weapons training, all that. They are targeted in the sense that, ‘You either work for us or we kill you’,” Mr Bergin said.