And that is: if the Foreign Intelligence Surveillance Act, which is the statute in question, as applied to the specific facts and circumstances of the NSA program, unconstitutionally -and these are the Supreme Court's words - impairs the ability of the president to protect our nation against attack, then that part of the statute itself is unconstitutional.
It found both the labeling statute and companion regulations unconstitutional because they forced producers to make involuntary statements contrary to their views when there was no material reason to do so.