Very few Trump supporters are concentrating on that issue. There a few who've been hung up on the issue since questions surrounded Obama's eligibility, but I think most people, no matter who they support, believe the issue is going nowhere and no court is going to rule anyone ineligible if they have any claim to born citizenship at all, either through one parent, or by virtue of being born on US soil.
The founders probably meant to have a restrictive requirement, but it's been lost over the centuries in the muddle of poorly written laws and amendments and court decisions, and no court is going to revive it.
Natural born v. native born.
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It’s like that “well-regulated militia” part of the 2d amendment. If it wasn’t there, we would have an ironclad right to individual ownership, rather than a challenged one.