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Snowden and the NSA
There are numerous restrictions on the president using the power of the military on American civilians. The Third Amendment, for example, forbids the peacetime quartering of soldiers in domestic homes, and the Posse Comitatus Act of 1878 forbids the federal government from employing military personnel to enforce U.S. domestic law.Similarly, U.S. law prohibits intelligence agencies from targeting American citizens. The National Security Act of 1947, which established the Central Intelligence Agency (CIA), explicitly prohibited the agency from having “police, subpoena, law-enforcement powers, or internal security functions.” The intelligence agency reforms that emerged post-Watergate required special court authorizations for surveillance of U.S. citizens. The boundary between justified and unjustified intelligence gathering has long been the difference between foreign and domestic.
However, the difference between foreign and domestic surveillance is no longer so clear. The majority of the communication infrastructure of the world is now located in the United States – giving, as one NSA document called it, a significant “home field advantage” to U.S. intelligence agencies. This may mean that elements of intelligence gathering can be used against domestic targets.
https://billofrightsinstitute.org/educate/educator-resources/lessons-plans/current-events/snowden-and-the-nsa/