In recent years, the United States has seen a massive surge of people trying to enter the country illegally or seek asylum at the border - mostly through the Mexico and United States border. Many of the millions of asylum seekers who have been let in now face years waiting for their asylum cases to be heard. Some are then sent to live in non-border State cities like New York. It's an issue that's now become central to the Presidential election with Donald Trump calling it a border invasion and promising a big crack down including mass deportations. Reporter Corin Dann visited the town of Nogales which is on the border of Mexico and the US swing state of Arizona.