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https://fs.wp.odu.edu/jrichman/2016/11/28/is-it-plausible-that-non-citiz...
The current estimate by the cooperative college voting assessment studies from 2012, 2014, and 2016 is that about 6.5% of non-citizens vote in presidential years, and about 4% vote in off-cycle elections.
That cannot be allowed to continue.