How do you do it? Deporting them would be impossible, but if I imagine many of them wouldn't be glad to hear they'll have no welfare and they'll have to earn money and pay taxes like a citizen (Now, I don't know how many of them are like that, but I can imagine the ones that are in their countries for years and can barely speak their language don't have good jobs) and maybe they will leave?
How do you do it? Deporting them would be impossible, but if I imagine many of them wouldn't be glad to hear they'll have no welfare and they'll have to earn money and pay taxes like a citizen (Now, I don't know how many of them are like that, but I can imagine the ones that are in their countries for years and can barely speak their language don't have good jobs) and maybe they will leave?