Fence #1: the existing set of rules defining a more limited US Federal Government and a more limited USCG and a more limited DHS
Fence #2: removed limits on Feds, expanded those organizations, placed limits on [insert economic activity]
Whatever your opinion on the wisdom/value of this, this move by the DHS is an attempt to replace Fence #2 with the original Fence #1.
Put in your terminology, they are replacing a set of rules (expansive gov) with a different set of rules (limited gov).
Put in my terminology, this is correcting the original violation of Chesterton's Fence.