Cruz will attack Trump because he's that way. However, I don't think attacking Trump is a good strategy as it has backfired every time and if he does get angry or walk off, as someone said earlier, he will shoot up in the polls. Trump wins when people attack him and shrinks when the issues are discussed. In fact, someone should immediately say that they believe Trump is a legitimate candidate now, so let's talk about the issues. Rubio should spend his time convincing the public that he is the right man for the job. The Ohio man just needs to let everyone else do his dirty work and win the Midwest.