Marriage equality has been spreading across Mexico as activists have engaged in a long-term strategy challenging discrimination in the federal courts and state legislatures. But after President Enrique Peña Nieto announced this summer that he would like to put marriage equality into the country’s constitution, conservative religious leaders have been mobilizing a backlash. Now, U.S. anti-gay activist Brian Brown of the National Organization for Marriage, who became president of the anti-LGBT World Congress of Families earlier this year, is headed to Mexico to show his support.

Anti-equality activists at the National Front for the Family organized marches in multiple cities last weekend that were supported by Catholic Church officials. They’re following up with a national anti-equality march scheduled for September 24. Religious conservatives would like to amend the constitution to ban abortion and sex ed as well as marriage by same-sex couples.

In a Wednesday email from the World Congress of Families, Brown writes:

WCF is launching a petition drive to give you and citizens across the globe the opportunity to add your own voice to the National March for the Family in Mexico City. Even though most people can’t be there in person, you can lend your name and voice to the effort to uphold marriage, protect children from “gender ideology” and support the right of parents to direct their children’s education according to their own values and principles.

I will personally deliver this petition to the leaders of National Front for the Family, including my friend, Rodrigo Ivan Cortes, when I meet with them in Mexico City.

The National March for the Family has the potential of being the largest single demonstration of support for marriage, children and parental rights in history. Beyond its significance in the domestic affairs of Mexico, this march also can help advance the worldwide movement to support marriage, religious liberty and the truth of gender that we were made male and female.

Both Brown and the World Congress of Families have a long track record of promoting anti-gay policies around the world.