Jacob Appelbaum is a hacker and a representative of Wikileaks who learned that being a privileged white dude can't protect you from government targeting. Since he's already lost his privacy in America, he asked a hard question to a FBI lawyer about what's left of ours.
TL;DR Here's what this FBI rep is saying: Sure, you can get a judge to review whether we have the legal right to monitor you anytime! But only if you know we're doing it. And since there's really no way to find out, you can't stop us from searching your digital stuff without you knowing.