As everyone knows, Trump is building a wall between the border of Mexico and America.
For Insstance, let's say that a parent and a child are in America and the rest of the family is in Mexico, how are they meant to get to each other without re-uniting with each other face to face? For another exmaple let's say there is a couple and the boy in the couple decides to travel to America before the wall was built. Then Maybe like a month later, the wall completed and the boy and girl are seperated forever unless they find a way to get back to each other and be re-united. So, they can only make contact with phone or telephone.
Trump's wall is not completed yet so maybe the families and couples that are seperated can be re-united.