He came to the US on an exchange visa. And then he brought his family. And then his visa expired. And then he applied as a refugee. And clearly he is not a true refugee, he just likes living in the US. And he should have left in 1997 but he's been fighting that order in the courts ever since.
I think it might be an unpopular opinion, but in reading the legal doc, he doesn't have much of a case to stay. He should have been deported 14 years ago. The real tragedy is that it took so long.
I wonder what this is referring to and how it reconciles with
> ... living legally in the United States for over 20 years
Something tells me there's more to the story than what's in the linked post.