explain the 5 major categories of congressional oversight of the intelligence community according to lowenthal 2020?

question 1 -according to Lowenthal 2020 what is a national security letter (NSL) ? WHAT IS ITS authority?

question 2- explain the 5 major categories of congressional oversight of the intelligence community according to lowenthal 2020?

question 3 according to lowenthal 2020 what are the types of convert actions used by U.S. intelligence community?
question 4 according to lowenthal 2020 what are the components of the national security process? explain the roles of each component?
question 5 according to lowental 2020 what intelligence information (counterintelligence) does the U.S. inteligence community seek to obtain about hostile inteligence services attempt to obtain inteligence on u.s inteligence operations?

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