Yeah? Where does it say immigration? You know USBP is bigger than immigration right? Drugs, weapons, currency, illegal goods, etc.

Even the largest cateogry of enforcement activity, illegal entry/removal - is itself much bigger than "immigration" which I take it to be people who want to live in the US or seek asylum.

Within illegal entry you have:

  Terror watchlist
  Cross-border sex workers (Tijuanenses commuting to work in US)
  Mexican wildlife/hunting violators
  Archaeological and horticultural looters stealing from Sonora Desert
  Ultralight pilots dropping meth in fields
  Recycling deportees (commuting to/from construction job sites in Phoenix)
  Smuggled minors (custody disputes)
  Chinese nationals on the run from China
  Dryback US citizens pretending to be aliens to get a free ride on ICE flights to Houston
  US citizen gotaways