Wouldn't taxing remittances be double taxiation? Should this tax apply only to Mexicans? What about corporations that send money overseas to buy stuff? Should they tax your money every time you move it from one account to another?
I am surprised that a conservative would be pushing for a new tax.
Corporations use the standard banking system and EFT to move money overseas, and are not impacted. The tax (which was in place earlier in the U.S.) is on cash transfer services such as Western Union. The tax on a service is perfectly legal and is not "double taxation" -- in any more other taxes you pay on your property, sales tax, and taxes on many other services at all levels of government are considered double taxation.
Conservatives believe in applying taxes appropriately to raise revenue for justified and targeted projects with clear revenue and spending plans. Conservatives are opposed to broad-based taxes with no clear objective where the money lands up in an over-sized government machine with no return on the revenue.