Was the secret NSA surveillance program legal? Was it constitutional? Did it violate federal statutory law? It turns out these are hard questions, but I wanted to try my best to answer them. My answer is pretty tentative, but here it goes: Although it hinges somewhat on technical details we don't know, it seems that the program was probably constitutional but probably violated the federal law known as the Foreign Intelligence Surveillance Act.

This is a detailed analysis. The Administration's Position is also available.