I'm waiting to hear my answer!
You seem to believe that foreign law might have something to do with what the US determines to be its citizenship laws. If you say that the Italian law saying someone four generations removed from being born in Italy is still an Italian citizen, and that might make an American-born child of American-born parents and grandparents not be eligible to be a President, what is so much different from any other country unilaterally declaring someone to be a citizen and equally obfuscating their eligibility?