Another artful legal vs. illegal conflation - citation needed. I have no doubt in my mind folks coming in on H-1B and O-1 visas contribute more than they take out: nobody is disputing that.

When an illegal immigrant making $2/hr under the table cuts his hand off at a meat packing plant, who pays the hospital bill? How many tax dollars does this one incident wipe out?

Vastly less than the tax dollars for all the foreign military interventions including the latest adventure in Venezuela, if you're really worried about wasting tax dollars.

A universal healthcare system would cover everyone in the country when it's needed. The US is a massive, highly developed economy, no reason we couldn't fund that.