Can I immigrate to Canada if I leave the United States illegally?

First of all, the rights of citizens are far greater than the right of permanent residence. He is an official Canadian and a permanent resident of China, but he can live in Canada permanently.

Secondly, you are a reunited immigrant. Even if you were repatriated in the United States before, as long as you didn't commit a crime (the crime mentioned here is a criminal offence, the kind you want to go to jail, illegal residence and petty theft are not counted), it won't affect your reunion.