If the USCIS is aware of his illegal entry and unlawful presence, he can expect to be turned down for the visa. If he's traveling on his own passport, I expect that the USCIS will be able to put at least some of the pieces together.
If the USCIS is aware of his illegal entry and unlawful presence, he can expect to be turned down for the visa. If he's traveling on his own passport, I expect that the USCIS will be able to put at least some of the pieces together.