Send him back to Mauritania. He’s an economic migrant, and he’s never going to send any money to his family either. He’ll be paid less than minimum wage, and he owes his smugglers. He’s a debt slave.
I suppose all these poor invaders will claim they will be punished by the smuggler cartels if they are sent home without paying debts, and as prospective crime victims have the right to stay here while a case is built so they can testify, which they will never do.
He will never send any money to his family, but the next amnesty will allow family reunification.