I recently wrote an article, "Trump's VP Choice and Eligibility," which you may have read and passed on to others. If anyone has disputed the article to you, linked below is an updated and much better version that should settle the issue once and for all. The law of the land states that Marco Rubio and Bobby Jindal are ineligible to be President because they were born of alien parents and thus not "natural born." But the law also states that Ted Cruz is a "natural born citizen" and thus is eligible for the Presidency.
Anti-eligibility advocates are correct about Rubio and Jindal (and as we will see below probably about Obama also). But they have gone one bridge too far when they try to say that Ted Cruz is not eligible. The official law of the land states clearly that he is.