If hes a Nigerian native he doesnt have any constitutional rights.
Might want to peruse this:
Looks as though at least parts of the Bill of Rights apply equally to non-citizens, but I did note that they do not have a right to legal counsel on our dime. The other thorny problem is holding deportees in jail for extended periods of time when their country of origin refuses to repatriate them. I guess that was part of the rationale for Gitmo since it isn’t on US soil.