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我准备申请入美国籍。 但禄卡明年4月到期。 现在交N-400表， 4月禄卡过期以后到 入籍批准之前有没有身份问题？
-You are always green card holder before you get the US citizenship (take the oath) even if your green card expires. But unless you renew your green card, you can not travel outside US after your green card expires and before you get the US citizenship and US passport .