It looks like the language in that part of the executive order was specifically intended to trigger this section in the law. So it seems legal, and means I can'

It looks like the language in that part of the executive order was specifically intended to trigger this section in the law. So it seems legal, and means I can't even say it was incorrect for him to include Green Card holders: https://www.law.cornell.edu/uscode/text/8/1182 https://www.law.cornell.edu/uscode/text/8/1182 > Suspension of entry or imposition of restrictions by President" > Whenever the President finds that the entry of any aliens or of any class of aliens into the United States would be detrimental to the interests of the United States, he may by proclamation, and for such period as he shall deem necessary, suspend the entry of all aliens or any class of aliens as immigrants or nonimmigrants, or impose on the entry of aliens any restrictions he may deem to be appropriate. Whenever the Attorney General finds that a commercial airline has failed to comply with regulations of the Attorney General relating to requirements of airlines for the detection of fraudulent documents used by passengers traveling to the United States (including the training of personnel in such detection), the Attorney General may suspend the entry of some or all aliens transported to the United States by such airline. I don't think anyone here explicitly said it was illegal, but I've seen a lot written that seemed to indicate that it was, which was the basis for me singling out the green cards in my other comments.