You’re ass-u-ming that the Border Patrol/ICE need any more funding than they already have. Want to save money? Get rid of the warrantless internal checkpoints inside of US borders that even harass US citizens. End the “war on some drugs” that’s costly and ineffective. If people want to kill themselves and fry their minds, who are we to stop them?
And return the Canadian border to pre-2000 status, essentially open. Hell, sign an open-border treaty with Canada as a start to full reciprocity with residence, work, and study permits for anyone without a major criminal records. It would benefit both countries.