Ultimately, it's not needed. What I'm saying here is that if you accept the view that security agencies need to collect information about people other than suspected terrorists, say travellers to a certain country, in order to identify new threats, if you accept that as a premise, the activity to be performed by the security agency would be to go through the information from all these travellers, the vast majority of whom are not security threats, with a view to doing analysis, correlating this information, and finding in the thousands of people whose information you have, the one, two, or three who may be security threats. So my premise is that out of the information on the thousands of travellers whose information is sent, only that of the two or three should be kept after it has been analyzed.
On November 22nd, 2016. See this statement in context.