Difference between Natural Born citizen (children born from parents of citizens)- that is one who inherits his citizenship from his parents and…someone who “becomes a citizen” by 1) operation of a man made proclamation, such as the declaration of independence, 2) a clause in the Constitution (as in 14th amendment) or 3) from Congress.
Marco Rubio does not qualify to become president because he was born of Cuban parents who were not citizens. Marco is naturalized citizen by operation of a man made law. However he is NOT a “natural born citizen” that would qualify him for the presidency. However, his children could qualify for the presidency as they would be born from parents who are already citizens. Note that it is the “father” that must be a citizen, even if the mother is not. One is not a “natural born citizen” if his mother (in the case of Ted Cruz) is a citizen but his father is not. The FATHER is the determinant
Ted Cruz: Father was a Cuban national but his mother was a US citizen. But the mother does not qualify Ted Cruz for presidency. It is only the FATHER status that counts. So, he can not qualify as a “natural born citizen”. Therefore he is disqualified from the presidency. Furthermore, he had dual citizenship until two years ago. He renounced his Canadian citzenship at that time.