From this:

Jorge Bustamante, the United Nations' Special Rapporteur on the human rights of migrants and a sociology professor at the University of Notre Dame, this week called Republican Party policies on immigration "immoral." Writing in the Mexico City daily Reforma, Bustamante said the Republican candidates share a in immigration stance that "lacks even the most minimum recognition of the demand for the Mexican migrant labor."

He called on Mexicans to harness "the real power we have as consumers" to boycott big companies that do business in Mexico and fund Republican candidacies...

He didn't suggest any specific companies, only suggesting an internet search. The second link describes how he met with Peter Schey of the Center for Human Rights and Constitutional Law, the National Immigration Law Center, the American Civil Liberties Union, and the California Rural Legal Assistance program in May.

But, in 1995 he went even further. In response to a possible presidential run by California governor Pete Wilson, he said:

I'm proposing to introduce an initiative that will facilitate permanent Mexican residents in the United States to become citizens of that country, so their increasing number will translate in a real possibility of more votes against Wilson in the next elections... ...This way if a Mexican by birth acquires U.S. citizenship, that fact would allow him to vote in the United States, without loosing his Mexican nationality... ...anyone who wants to defend the interests of Mexico in whichever country they reside, augment their political power in order to make it within that country's rules...