Pretty flimsy.
So then everybody who says "vote for Trump" is doing so because Trump arranged for them to do it.
Cruz was involved however. At about the 4 min mark is a Cruz spokesperson discussing the same content about Trumps wife as was in the ad live on Fox 2 weeks before the Ad ran in Utah.
https://www.youtube.com/watch?v=ALErcfr7jQ0&feature=youtu.be