Intentionally collecting everything to include millions of U.S. persons data, say the collection was "incidental", put the computer equivalent of a removable sticky-note over their name to say it's been "minimized" and thus a-okay for the NSA to use...
There is a debate the bulk of NSA's leadership has been wholly uninterested in having over what they do with regards to acquiring and parsing U.S. persons' private communications, instead preferring to use word-games and rhetorical sleight-of-hand.
Everything I've seen about the NSA domestic collection debate and publishings and statements from officials have boiled down to:
*The NSA taps communication sources they know with absolute certainty contains an enormous amount of U.S. persons' information because these sources also contain non-U.S. persons communications. An effort is made to remove U.S. persons' information from this programmatically but this step frequently leaves an enormous amount leftover. Despite this - the NSA intentionally parses these private communications - that include that of of millions of U.S. citizens - in bulk. That it isn't their intent or mission to specifically acquire and parse U.S. persons' communications are not germane considerations. Actions matter more than words.
*The NSA justifies this by dint of "it's okay, everyone! We trust ourselves to never do anything bad with your information! We never meant to acquire it! But we did. And we will keep acquiring more of your info 'incidentally' as your privacy is something we are willing to sacrifice in our efforts to acquire foreign intelligence."
*The NSA shares an enormous amount of U.S. persons' private communications with other intelligence agencies to include the FBI. Again - that it was not the NSA's intent nor mission to acquire the information to begin with is not relevant when they, nevertheless, keep getting the information!