While they both fall under DHS, you're confusing CBP with ICE.

CBP's job is to protect the border and stop drug and people trafficking entering, whereas ICE's original purpose was to enforce immigration law within the US.

While not "everything" ICE was tasked with was immigration, that was their bread and butter. Where the vast majority of their workforce and spend went.

I'm pretty sure these days it's 95+% immigration, though.

Even if that were true, so what? ICE's violence and overreach are unacceptable and its culture is rotten to the core. The agency needs to be abolished. If there are functions they're performing that we actually need, move those functions elsewhere, but as an agency ICE is irredeemable.

They were doing that before the 10x budget, yeah?