Regarding Mexico, they are also a party to the refugee convention, so they have obligations there as well. If someone claims asylum within Mexico, Mexico is obligated to determine whether the person is genuinely fleeing persecution and needs protection and then to offer them that protection, as a party to that convention.
In terms of Canada's engagement with Mexico, we have provided capacity-building to Mexico, in the past, to assist them to improve their own asylum system, so they are better able to receive claims from people who are coming into their country—whether they are from Central America or elsewhere—to determine whether they are genuine refugees and to be able to keep them in Mexico for as long as they are suffering persecution.