Obama has always run his campaigns this way. Look back to when he was running in Illinois.
His M.O.: Dig thru the opponent’s record, extract whatever, then proceed to slime the opponent in the hope that the opponent will back out. He knows he can’t win an honest election.
That status, in my opinion,* requires that both parents be citizens of the United States.
In my opinion,* the person now holding the office of President is not constitutionally qualified to to do so, because like Rubio, both of his parents were not citizens.
*The courts having refused to opine in this matter, my opinion is just as good as anyone else's. Since Rubio knows just as much about his eligibility and the Constitution as I do, I fault him for allowing his name to be mentioned for national office without seeking a legal opinion.