Do you think immigrants are only interested in welfare?

That's the line from the right, but is it true? The only immigrants I know (I don't know whether they're illegal or not) are very hard-working. So going by anecdotal evidence, I would say "no".

My one qualm would be they all seem to have large families and their families keep getting larger. Seems like if your financial resources are limited, you might put less of an emphasis on a large family, but I'm just saying. That happens with "native born" Americans as well.