The legal fiction for Obama’s amnesty is a suspension of deportations as a matter of prosecutorial discretion. Hiring new permanent staff is not a suspension of deportations. Agencies are capped in the number and allocation of FTEs. Violations of these ceilings would be violations of the anti-deficiency act.
Right now my office is busy working up cases on "dreamers" because their "American Dream" includes drug trafficking and fraudulent document trafficking. Don't even get me started on the child prostitution rings.