What are these rules that you refer to? I know a lot of people who could benefit from such rules having come to the United States legally and spending 10 years and has to leave because their visas were expiring.

I am not too familiar with the details, but the government website is informative, as is the Wikipedia article.[1][2]

[1] https://www.uscis.gov/us-citizenship/citizenship-through-nat...

[2] https://en.wikipedia.org/wiki/Naturalization#.C2.A0United_St...