There's plenty of scenarios where interest payments result in the remaining $580b/year in savings, bringing the total up to $2t.
Now, sucking $2t/year out of the US economy all at once - even $2t in waste and fraud - would *not* be good for America! That kind of economic shock would bring the US economy to its knees, for years to come. All that money still fuels the demand side of the economy.
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