A friend's father obtained a green card under her daughter's sponsorship years ago. At that time, China was a fairly open society. No one cared about CCP member status in the USA. He MIGHT check "never be communist party member" on his green card form. Now, everyone hates CCP. What are the consequences if the US federal agency finds out that he was part of CCP at the time of application? Is that perjury or fraud? He is a US citizen now. What's next for him?