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> Green card holders are essentially long term visas with citizenship grants for good behavior No. One of the major distinctions being – CBP cannot deny a green card holder to enter the country. They can try pressure tactics to 'convince' the person to 'voluntarily' give up their green card but, if they don't sign anything, they will still be let in. If there's something off about their case, they may be referred to…
US Citizenship used to be revoked for these things, but that’s not recent.