With regard to citizenship revocation, essentially citizenship can be revoked if we have evidence that the person made a false or misleading statement, or committed fraud with respect to an element regarding admissibility. A ground for admissibility, for example, would be whether a person is a threat to the security of Canada. So if we later determined that there had been fraud, that the person had covered up membership in a terrorist organization at the time he or she applied for citizenship, we would be able to go through a process that would essentially allow us to revoke citizenship if we could determine fraud had been committed or misrepresentation with respect to what was told us at the time of application for citizenship.
On February 7th, 2017. See this statement in context.