supreme.justia.com/cases/federal/…
(See, e.g., repository.law.umich.edu/cgi/viewconten…)
But what's especially vexing is how lower courts have subsequently _extended_ it, like the DC Cir. in Saleh:
pacer.cadc.uscourts.gov/internet/opini…
The more interesting question is which areas, and why.
/end