Earlier quoted context omitted.
The US has an obligation to spy to the maximum extent possible on foreign citizens and entities. Just as every foreign government has the same obligation to spy on the US.
Do we? I would say that the obligation of the US government is to follow the goals set in the Constitution as much as possible, until such time as the Constitution is amended or replaced. As much as spying does "provide for the common defence", it is defensible. When the spying alienates allies, it is too much. When the spying forces foreign-held companies to pull out, can it really be said to "promote the general We…
Spying is the cheapest and most effective way to provide for these goals.