Alex Ayton and Kathleen Olds are both students at Dalhousie University, where they are involved with the environmental campaign Divest Dal.
As the prime minister made his way down a line of supporters at a coffee shop, Ayton and Olds were ready for him.
"Can we also get a selfie?" they asked innocently.
But instead of just taking a photo, they recorded a video instead.
"Are you planning on implementing UNDRIP?" Olds asked Trudeau, referring to the Liberal campaign promise to adopt the United Nations Declaration on the Rights of Indigenous Peoples.
After Trudeau said that he was still committed to UNDRIP, Olds asked him if that meant "requiring consent" from First Nations before approving natural resource projects — another Liberal campaign promise and a plank of UNDRIP.