text:  This is James Menendez with NewsHour. Australia is a migration nation. A third of its population was born abroad and it prides itself on its multiculturalism. But are the rules applied equally to disabled people? Many foreigners with disabilities or medical conditions are routinely denied an Australian visa. And even those already living in Australia face the threat of being made to leave. But campaigners are pressing for change as Katie Watson now reports from Perth in Western Australia.