Since when do other countries get to decide which of our citizens is eligible?
Granted, Zero doubtless thinks we ought to respect their opinions in that matter and others. But he's our first anti-American president, so that's hardly a surprise.
Turn that around ... since when does the United States get to decide which of a foreign country's citizens is eligible? I'm talking about children born in foreign countries to parents who are US citizens. It cuts both ways ...
The Constitution was written in a time when travel was harder and moving was more or less permanent. Aliens in most countries were permitted to be naturalized - and their children were deemed to be natural born. This, since most would never move again. As long as the alien parents' nation DID NOT lay a claim on the child ...
Now, with our ease of travel, the Founding Fathers would accept our current understanding that a child who was born on foreign soil is a natural born citizen, as long as his parents are US citizens and the foreign country DOES NOT lay claim to the child. Otherwise, the child is a citizen - though NOT natural born.