Well there is nothing the US can do about it though. We can only accept this and move on ... ultimately the US is not some dictatorship/pariah state that would deport tens of millions of undocumented immigrants. Most of these people are still extremely hard working people and of course human beings.
USA can deport a lot of undocumented immigrants. It has the law enforcement capacity to do it in a efficient and humane way. Sorry even a lot of legal immigrants would support that. There is a reason Trump is still polling 45%.
Should we do that ? That is a different discussion