The plan is controversial

(Senior Citizens League, “Totalization With Mexico Would Add Billions In New Costs To Social Security,” pg online @ https://seniorsleague.org/totalization-with-mexico-would-add-billions-in-new-costs-to-social-security/ //um-ef)

Totalization with Mexico is highly controversial because of the millions of Mexicans who have illegally worked in the United States without authorization. The agreement raises concerns that millions of such workers and their dependents would become newly eligible for Social Security benefits worsening the long-term solvency of the program. In addition, substantial new costs could trigger benefit cuts and higher taxes for both retirees and workers.