Letting them back in is not my position.
In regards to "spending all that money", our government spends (wastes) hundreds of billions on much less noble ventures. The problem is priorities, like defending this nation from Invasion, not money. Even here, the most cost-effective way of reducing illegal immigration is enforcing the immigration laws already on the books and sanctioning employers that hire illegals. Take their jobs away, and many will deport themselves.
And I don't buy the OBL line that the economy will collapse without illegal aliens. How oh How did America ever become the most prosperous nation on earth without their help? I suspect the opposite will happen. Our economy is already laboring under the extreme burden illegal aliens have placed on American Taxpayers, state coffers and the public infrastructure of this country.
If there is any contraction at all it will be short-lived and followed by a robust expansion fueled by American Taxpayers having more money in their pockets to spend on real things. Not on sky high medical insurance premiums, ever higher property taxes, income taxes, sales taxes to fund the Billions in Social Costs that welfare mooching Illegals exact on this country.
So you don't support a guest worker program?