Several conservatives in the country have criticized the decision, saying that Robin, 25, is representing a country that does not want to be represented.
Beauty pageants are rare in Muslim-majority Pakistan, the report said.
Robin, who is a Christian, was earlier chosen as Miss Universe Pakistan from among five finalists at a competition held in the Maldives.
The Miss Universe will take place in El Salvador this November.
In the competition’s 72-year history, Pakistan had never nominated a representative for Miss Universe, making Robin the first from her nation.
During her selection, Robin was asked to name one thing she wanted to do for her country. She said “I would want to change this mindset that Pakistan is a backward country.”
Ironically, the backlash over her nomination has brought the same mentality to the fore.
Senator Mushtaq Ahmed of the Jamaat-e-Islami party has labeled the decision as “shameful.”
The outcry has even prompted the caretaker Prime Minister, Anwar ul-Haq Kakar, to order an official investigation, according to BBC.
Reacting to the outcry, Robins said “It feels great to represent Pakistan. But I don’t understand where the backlash is coming from. I think it is this idea that I would be parading in a swimsuit in a room full of men.”
The BBC quoted Karachi-based writer and commentator Rafay Mehmood, who remarked, “We are a nation of many contradictions and women and the marginalised trigger us the most. Pakistan is at large an authoritarian state and that reflects in the harsh patriarchal values it enables both institutionally and socially. Erica Robin and the policing she has faced is an extension of that.”