It has a lot to do with being “establishment”. The establishment has attempted, since 1970, to have the Art. 2 eligibility restriction amended OUT of the Constitution, and also tried to have laws passed giving foreign born persons legal right to the Oval Office. None of those 15 attempts have been successful. They were cautioned on the attempt to merely pass a law, that a amendment was the best way to go - because a law could be CHALLENGED IN COURT.
A dual citizen elected to the Oval Office, or even a naturalized citizen, could not only have divided loyalties, but also be subject to legal claim from another country.
Lord. Rubio is eligible. Once your Mother puts her foot on American soil and gives birth, you are a citizen. That easy.
Cruz wasn’t even born in the country and his father was Cuban. He is way more likely not to be eligible then Rubio.
I don’t like a candidate being born in another country. We have 320 people in the country, clearly we can just pick those born in America at least.