The claim was that it was illegal to name your running mate before becoming the nominee. The fact is that it isn't. Now in Cruz's case it's an act of complete desperation and will be looked at as such, and really makes him look ridiculous. But it isn't illegal.
He's going to have a prayer-a-thon?
His daddy had a dream last night?
His wife had a vision???...of 10,000 cans of soup!