No new arm of government is needed...
We have the best enforcement agency in the world already, but they are busy securing Iraq instead of America.
Fine but enhanced enforcement has to be up and running and fully funded before any new amnesty. There are plenty off illegal alien criminals to start deporting before a new amnesty kicks in.
It’s a lot harder logistically to get deportees on airplanes and ships and out of America than it is to say - Hey y’all (20 million illegals) we passed a law and y’all can get your Z Visa amnesties now