Today Trump sided with Reid, Pelosi, Boehner, McConnell, and Obama against Cruz. Attacking Cruz from the left may play well on FR, but it remains to be seen how well it plays out is Sourh Carolina and beyond.
It's only playing well with the deep into the kool aid crowd. Many trumpettes no where to be seen today. I suspect many will skip it for a while. And no, attacking is fine, but attacking FROM THE LEFT and FROM THE ESTABLISHMENT play book is really stupid.