There are a couple of questions that you need to consider.
1. Are they a resident?
2. If they are a non-resident, does your bank have policies against lending to non-residents?
In many banks, residents are treated the same way as citizens. I would think you could have fair lending issues with your regulator if you do not lend to legal residents. As far as lending to non-residents, there are strong arguments for not lending, such as collection, etc. If you choose not to lend to a non-resident (i.e. you decline them for that reason), you're bank's lending policy needs to address that.
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The opinions are mine and do not necessarily reflect those of my employer.