the US has assured that it does not conduct mass or indiscriminate surveillance of Europeans
A lie so profound that there ought to be a new word for it. Gigaporky, perhaps. Apart from setting up a PA system in Ireland powerful enough for them to hear it; looping the screamed words "You lying cunts" on a loop (possibly a job for Brian Blessed there) there just does not seem to be a suitable response apart from a sad, tired, "Oh, do fuck off".