He most certainly is. If his parents were legally within the United States at the time of his birth, he is. This is what the phrase meant at the time it was written, and has been adjudicated multiple times. Not debatable.
Macho’s correct.
“If his parents were legally within the United States at the time of his birth, he is.”
“Legally” is not the same as “Citizen”. Being in the US on a student/work/visitor vias does not make foreign nationals citizens of the United States. He is a citizen at birth..as is Harris, Haley, Jindal and the rest of the goobers. But he is not NBC.