Doesn't take that much extra money. Redirect funds. Install an electric fence. End "catch and release" in exchange for "catch and prosecute". Permit border patrol to use lethal force if necessary to apprehend suspected illegal crossers. Sue sanctuary cities to require them to turn over suspected illegal aliens to the INS.
Then why didn't congress appropriate those funds? Why doesn't congress authorize funds for a border fence and thousands more border patrol and INS officers?