Exclusion has never worked. The wall that is constructed now along the Mexican border is ineffective because it (or any other) will never work. You need to go to the mountains, rivers and deserts that simply cannot be walled.  PP gets government grants and reimbursements for the services that are provided to women.  This "wall" is going to cost a lot more than the $500,000,000 that is reimbursed to the affiliates that actually provide the services. You are barking up the wrong tree. How about lowering the subsidies and tax incentives to the oil industries? Now, there you could actually collect about 37.5 BILLION. Think about it!