Thursday on Fox News Channel’s “The O’Reilly Factor,” Sen. Marco Rubio (R-FL), a candidate for the 2016 GOP presidential nomination, was asked about his thoughts on his opponent, nomination front-runner Donald Trump. Rubio was particularly critical of Trump for his reactions to his critics and for what he suggested was a lack of knowledge about policy. Partial transcript as follows: O’REILLY: All right. New Bloomberg poll has Trump 21, Ben Carson 16, Jeb Bush 13 — that’s different from the Fox poll. He is at 7 in the Fox poll. Carly Fiorina 11 and you are at 9. Everybody else is kind of out of it at this point. When Governor Walker quit, in his remarks he said that he hopes all of the remaining candidates will join together to defeat Trump. What did you think when he said that? RUBIO: Well, what I think is we need to have a real — someone who is a serious person, someone who is serious about the future of our country. Someone who understands the challenges we face. This election is not about any of us individually. It’s about the United States of America at one of the most critical times in its history