Tamara Argote will represent Bogotá
Country's president said measure violated international treaties
Men's attorney says many hurdles remain
Angélica Lozano is married to Bogotá Mayor Claudia López
Plaintiff criticized government 'crusade against same-sex marriage'
Measure also defines family as a man and woman with children
Gabriel Boric's Cabinet has two out members
Vigano alleges that Zelensky promulgates policies to embrace, including gender equality, abortion and the green economy
Two same-sex couples married in country's capital on Thursday
Advocacy groups expressed disappointment over decision