Easy enough. Shutter defund and close those agencies.
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You sound like the "Defund the Police" dumb@$$3$. So -- without planning for replacements, you want to kill off the primary interstate crime fighting organization -- and the main organization that keeps an eye on little troublemakers like Iran, China, etc.
Not much into long-range planning, are you? The term that comes to mind is, "simpleton"...
TXnMA