Let me be absolutely clear, legal immigration is one of the greatest strengths of the United States. Immigrants who risk everything and desire to become Americans help drive our economy in so many immeasurable ways.
That said, in 2016 $116 billon dollars left the United States via money transfers. The bulk of these funds do great good for our neighbors to the South and shouldn't be restricted. However, I wonder how much of this money was taxed? How much is from criminal activity? How much is actually originates from government support payments?
If the funds collected by taxing remittances were used to offset boarder enforcement costs and improve the quality of our treatment of those who end up in custody at the boarder I'm all for it.
Oklahoma currently charges 1% for remittances and I suggest the federal government consider doing something similar. Charging 1-5% would have little impact on the good these funds do down south and would allow those living in the shadows in our country to pay their share.
PS Our asylum laws must be updated to reflect modern reality. Families traveling 2,000 thousand miles through Mexico to claim asylum in the United States is fraudulent at best. Furthermore, birthright citizenship should be re-evaluated as many countries in the world already have.