Will Cruz and Rubio go after one another or is this a Trump ambush
Cruz and Rubio gain nothing by going after each other. They, and the Fox Moderators, need Trump to have a Howard Dean style meltdown. This is what you will see the rest of the campaign. Everyone will gun for Trump 24/7/365. This will be a war of annihilation. No one is going anywhere until they are absolutely forced out.
Only Trump can stop Trump and they know it.