Tom,

Title 8USC Sec1403 is not applicable here. Yes John McCain is a Citizen. No question. The Question is: is he a "Natural Born Citizen" as is required by the constitution? The answer to that (See United States v. Wong Kim Ark) is an emphatic NO. The Meaning of Article II Section 1 Paragrah 5 is quite clear. No person not a natural born citizen (see the concept of jus soli vs. jus sanguinis in law) or a citizen at the time of the enacting of the constitution are eligible to be president of the united states.