I am a Trump supporter and there is absolutely no way I would consider supporting Rubio unless it’s in the general election. My support would go to Cruz.
Rubio was picked and groomed to support establishment policies. They like his young look, ability to deliver speeches and talking points written by others, his rags to riches(hmmm potential riches) and his appeal to latinos.
Nobody really knows who the real Rubio is. Myself I put him in the RINO category.
Rubio is an amnesty kick the can down the road Rino.
I would prefer to see Cruz win, but I must admit that a Trump-Cruz ticket (with Trump at the top) would work very well for a whole host of reasons.