There is no exhaustion requirement to fulfill in order to bring a viable claim for financial support through the I-864 contract. This means that if your spouse or ex spouse is not fulfilling their financial obligation to you, you do not need to alert or depend on any government agency before suing and collecting on your own. You can enforce your own rights straight away.
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source https://www.reddit.com/r/immigration/comments/rv464p/864_enforcement_tip/