Lied on Citizenship Interview. Possibly deported?

A friend of mine just had their US Citizenship interview. He has been deported in the past and came back a second time. The immigration officer has asked him during their USC interview if he had ever been deported, and he said no (as the his lawyer advised him to deny it). At the end of the interview, the officer did tell him that there was a record of deportation that showed up on his file through fingerprint verification. He received letter from the officer saying that his citizenship was pending approval. I did tell him it was stupid to lie, since they have records of everything. But now I want to know if he will be granted the citizenship, or will there be other consequences. What do you think?