They are not undocumented, most of them have multiples sets of fraudulent documents.
They are not immigrants, they did not apply to be immigrants.
They are illegal aliens and the law says they should be deported.
And they should be deported.
Criminals first, but we should not wait until they kill someone before the deporting the rest.
It took 30 years to accumulate 30 million illegal aliens, it will take a while to remove them all, but we should remove them all.
After we show we are serious about enforcement, many will leave on their own before we deport them, particularly if they ever want to come back. After a deportation they must wait 10 years to apply.
I heard a LEO call in to a radio station and talk about the acquisition of a TIN as a way for these people to set their residence in order. A personal TIN.
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Invaders is the correct term.