The "Big Lie" again. "Cruz's campaign surrogates" had nothing to do with it. It came from Liz Mair's PAC- and she is no Cruz fan either.
Apparently neither side offers "proof." So people are free to believe or not believe, as they choose.
As John Edwards said, "I did not have children with that woman," until he did.
As Bill Clinton said, "I did not have sex with that woman," until I did.
So you see, protestations by political figures and their supporters are just that; protestations.
I start with the assumption that political figures all lie, cheat, etc. If occasionally one does not, great. But no pedestals, not even for the one from Alberta.