They have A2 visa but they are not diplomats they work as a local employee and they are here almost 15 years now.
You need to qualify for special adjustment, more information is needed.
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You should meet with an attorney to discuss in detail.
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Unfortunately there are more options available as G visa holders/retirees versus the A visa holders. As A visa holders whether local staff or full fledged diplomats, in order to apply for a green card under Section 13 you essentially need to show compelling reasons why you cannot return to your native country. Its not as high as asylum but still, you can't just say we like it here and don't want to go home. You need to consult with competent counsel to analyze the facts and see whether they support a Section 13 application since each year there are only 50 green card immigrant visas available for former A visa holders.
More information is needed before an opinion regarding adjustment is rendered , but I agree that adjustment for A visa holders may be more difficult than for others. Consult with a local attorney.
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