This is a policy that will have many unintended consequences.
LPR are immigrants who stood in line, played by the rules, and came to this country legally they did everything we as a country required them to do legally and by the book...
But if they are from one of these countries whether they are Muslim or Christian and and they happened to be out of the country they suddenly can't get back. No matter whether they have jobs here, mortgage payments to make, kids in school.
This is the kind of policy I expected/expect from Trump. An amoral azz who has elevated lying and shyster-ism to an art form.
So if you are a rational LPR in this country, you don't leave, but do you bother to renew your green card next time it expires. Maybe not, what is the incentive...and doesn't it just make it easier for the government to keep track of you...and why bother to pay taxes...as soon as you step foot out of the country there is no guarantee you can come back...
At one time this country valued it word and was a beacon of justice and fair play for the world to emulate. Trump and his amoral ilk are determined to destroy that legacy....