His visa might or might not be canceled but his chances of being refused admission on it are very high. Suggest he quit using the visa and instead wait until his I-730 is approved so he can come as a refugee derivative.
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He is risking not being allowed into the US if he keeps using the visitor visa while your I-730 is pending. He should be aware of the risks.
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He should not be using a B-2 visa while the I-730 is pending.
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Carl Shusterman, Esq.
Former INS Trial Attorney (1976-82)
Board Certified Immigration Attorney (1986 - Present)
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(213) 394-4554 x0 Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.