Your ESTA authorisation needs to be valid for when you enter the U.S. and will allow you to stay within U.S. territory for up to 90 days from when you land. If the ESTA expires while you are in the U.S., it will not affect your admissibility or the amount of time you are permitted to remain in the U.S.
Can you get a green card if you overstay your visa?
Yes, you can apply for a green card if you overstayed a visa. You can apply to become a green card holder from inside the United States (known as an adjustment of status) or abroad (through consular processing).
Can I travel to the US if my US passport expires in 3 months?
Answer: Yes, you are right. Your passport only needs to be valid for the duration of your stay in the United States. As long as you can provide proof that you will leave the country before your passport expires, there should be no reason to deny entry.
What if my US passport expires while Im abroad?
If you are overseas and your passport expired on or after January 1, 2020, you may be able to use your expired passport to return directly to the United States until December 31, 2021. Or, if you were 15 years of age or younger when the passport was issued, your expired passport was valid for 5 years.