Fix this would turn down political heat in a good way.
Let the people who don't want to be here move; when you tax the hell out of them even if they move, they stay here and fight you instead!
Every politician should be for this if they don't want to be attacked.
As Americans, they’d still have to file (and potentially pay) tax returns in the U.S., one of the only major countries to tax based on citizenship rather than residence.