Yes he is. Read the constitutional requirements for president.
Conservatives will have to convince him to be Vice President, let alone running for President.
He has said no repeatedly to both.
Rubio would look like a fool running for President at this late date. I don’t know if he would take the VP slot .. no one does except him. He has said no about 40 times so far.
So you approve of anchor babies being eligible. Keep that in mind when the Dems run a Somali or a Chinese anchor baby.