A US Citizen cannot be deported. Period. We don't deport U.S. citizens, we send them to prison. A person who is in the process of naturalizing is not a U.S. cittizen and can therefore be deported is deportable under U.S. immigration laws.

If the government was to determine that an alien provided false/fraudulent information on his/her application for naturalization or obtained his/her residence unlawfully, the government can move a Federal District Court to revoke the citizen's certificate of naturalization. If this was to occur, the citizen would revert back to a permanent resident and possibly become subject to deportation.