The collecting operation is incidental and legal. However, this legal foreign intelligence collection produced a dozen reports that unmasked some individuals' identities (not just Flynn) and were widely disseminated. What is troubling is those reports and their spreading & leaking, not the collection itself.
Link: http://www.foxnews.com/politics/2017/03/22/trump-team-communications-captured-by-intelligence-community-surveillance-nunes-says.html
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