Cruz is not a natural born citizen since he was born in Canada to an American mother and a Cuban-Canadian father, and until last year was a dual Canadian-American citizen. In 2014 he conveniently renounced his Canadian citizenship in the nick of time to run for the presidency. Rubio, on the other hand, was born in the states, but his parents were not citizens at the time of his birth. Thus, these Cuban-American senators are technically ineligible to be president.
For Sens. Cruz and Rubio, it is too bad they were not also born to black mothers or fathers. If they had been so fortunate, like Shiite Obama, they may have escaped scrutiny. But for these Cuban-American pale faces, their chances to win the Republican nomination for president is likely doomed. By my estimate, there is roughly a third of the Republican electorate which knows and cares enough about the Constitution to cause them to vote for other GOP presidential candidates. And, this makes The Donald the likely winner at this point of the primary season.