Rubio is the most often advanced name for Vice President. His parents did not become US citizens until after his birth.
Do I even know what makes a person a natural born citizen? Check my postings over the last four years.
Natural Born Citizen: A person born on US soil whose parents at the time of that birth where US citizens.
Santorum: His father immigrated from Italy and became a naturalized citizen some time after Rick’s birth.
Romney: His father was born in Mexico to non US citizens. He latter entered the US illegally. Was he naturalized or not, if so it was after Mitt’s birth.
The research on this, primarily related to Obama, has been discussed and debated by many on this forum over the last four years. Read and enjoy!
I think it was Santorum’s grandfather who immigrated from Italy.