The existing laws were mostly toothless, inviting abuse. Illegal entry into the U.S. is, for instance, classed as a misdemeanor. The workplace enforcement laws are similarly diluted. Nor were enforcement attempts adequately funded.
The House bill is designed to eliminate these flaws -- make the penalties mean something and fully fund enforcement, on both the border and the workplace.
Where's the money coming from to "fully fund enforcement"? Not a dime more out of my pocket, I tell you. But don't let me stop you from donating of your own free will.