The document discusses how the NSA focuses on collecting intelligence from anywhere it can, including domestic communications, believing it serves the national interest. It collects the communications of everyone and filters, analyzes, measures, and stores them for periods of time as the easiest way to potentially target those associated with foreign governments or terrorism, even though in doing so it collects ordinary Americans' communications. The NSA targets and collects everyone's communications by default in order to potentially target a few individuals.