[learc83]

Where do you get the idea that we admit a significant number of penniless legal immigrants?

[mathgeek]

There are published numbers for immigrant income levels, for those interested in a little research:

https://www.ssa.gov/policy/docs/ssb/v68n1/68n1p31.html

[learc83]

Immigrants typically require sponsorship from a family member with minimum income requirements.

The minimums aren't high, but the sponsor has to make enough to support them, specifically so that they don't require government assistance.