[Valpal1]

It’s a safe bet he doesn’t have a US passport, but a British one since he was born in the UK to a UK Father and US mother.

[definitelynotaliberal]

And that’s really one of the only 2 documents that matter, the other being the permanent resident alien permit (the green card).

[kabar]

You nailed it. If he had a US passport, there would be no problem. He obviously traveled on another country's passport, probably from the UK.

Since the UK is on the visa wavier program, he would not need a visa to enter the US, but by traveling multiple times within a year, he would have a problem re-entering the US. You can only stay up to 90 days at a time up to two times a year.

The U.S. Embassy told Grant her son was indeed a citizen because Grant was a citizen. He received a Social Security card and lived in the U.S. through 2015.

BS. The Embassy would never have told him that. I wonder how he got his SSN? Thru Obama's DACA program?