It was surprising to hear that Marco Rubio is an expert in National Security. His only experience is being on the committee. An a former Professor in Strategic Studies, all I can say is that his National Security are not going to fly internationally and not even with Americans. It is easy to talk tough, but when the President gets the daily intelligence briefings he is going to realize how difficult it is make critical decisions. As a rookie Senator, he is going to learn on the job and probably make some bad decisions.
While President Obama may not have been very responsive on National Security, at least he has not made any seriously bad decisions. On National Security the only person on the Republican side who has a responsible and deliberate mind is John Kasich.