Brian Brown, president of the National Organization for Marriage (NOM) and the World Congress of Families (WCF), will lead a protest at the Mexican embassy in Washington against a proposal to legalize marriage rights for gay and lesbian couples throughout Mexico.

Mexican President Enrique Pena Nieto in May asked lawmakers to debate the issue. While Mexico's highest court has ruled that gay couples have a constitutional right to marry, most states continue to deny marriage licenses to gay couples.

The Roman Catholic group National Front for the Family (FNF) earlier this month organized marches against the proposal in multiple cities, which drew, according to Reuters, “tens of thousands” of protesters to the streets. The activists are calling for a constitutional amendment which would exclude same-sex couples from marriage. A national march in Mexico City is scheduled for September 24.

(Related: Boy confronts thousands of protesters marching against gay marriage in Mexico.)

In a Facebok post, Brown said his protest would be held on Friday at noon in front of the Mexican embassy in Washington, D.C., and that protesters would be delivering a petition in support of the FNF to Mexican officials.

“We will join together to show support for the efforts by the Frente Nacional por la Familia (FNF) and other leaders in Mexico to oppose radical proposals by Mexico’s government under President Enrique Peña Nieto, which include: imposing same-sex ‘marriage’ across the land, in every legal venue; promoting 'gender ideology' in public schools so that children are taught that they can choose their own gender; and undermining the right of parents to decide on the education of their children according to their own convictions and principles,” Brown wrote.

“Our gathering will feature some notable Hispanic and Latino pro-family leaders, and we will be delivering a letter to the Embassy showing support for the efforts of the Frente National por la Familia and their millions of grassroots supporters,” he added.