The NSA falls under the Department of Defense, they are a military tool. It is directly under the command of the Commander-in-chief, ie the US President, at all times, period.
They do what he commands. If that's not the case, then the United States is under siege, and the government has suffered a coup.
They do what he commands. If that's not the case, then the United States is under siege, and the government has suffered a coup.