If he entered without inspection, then he will likely need to return to his home country to apply for an immigrant visa, and also will need to request a special waiver to return. It is not a simple process, and you should hire an attorney.
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More information is needed to evaluate the case.
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I agree with both my colleagues.
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THere may be a way for him to obtain legal status, but it is complicated, and will require him to leave the U.S. for at least a few months. Much more information about you and him is necessary to determine what options are available and whether it is a good idea to pursue them. Set up a consultation with an immigration lawyer.