I’ll post this again.
This is the law when McCain was born. I think it’s pretty clear. He was a citizen right from birth.
2. May 25, 1934 to January 12, 1941
If you were born between May 25, 1934 and January 12, 1941, you acquired U.S. citizenship at birth if both your parents were U.S. citizens and at least one lived in the United States before you were born. You didn’t have to do anything special to keep your U.S. citizenship.
You could also get U.S. citizenship if only one of your parents was a U.S. citizen, as long as that parent lived in the United States at some time. If your U.S. citizenship came from only one parent, you would have been required to reside in the United States for at least two years between the ages of 14 and 28 in order to retain your citizenship. If the one U.S. citizen parent was your father and you were born outside of marriage, the same rules applied if your father legally legitimated you.
This is from FIND LAW
I think the confusion comes from the natural born vs. naturalized citizen, nikos. No one is saying McCain is not a citizen. The assertion is, since McCain was not born in the U.S., or even any land within U.S. jurisdiction, he was therefore naturalized. The legal complaints that are filed in the states McCain won primaries say he only acquired citizenship by jus sanguinis due that both of his parents were U.S. citizens.