You can protect your assets with a pre nup. However, you do sign an Affidavit of Support and if your spouse becomes a public charge and obtains means tested benefits, the government has the right to go after you.
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What are you trying to protect yourself from? If it is your assets you are trying to protect, you should speak with a family law attorney that deals with prenuptial agreements or an estate planner. I don't see what you need to protect regarding immigration in this situation. Good Luck.
I agree with prior response. If you have assets which you are trying to protect, you should consult with a matrimonial attorney about drafting a prenuptial agreement where everything will be spelled.
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