This was in response to Mitch McC's ambush of him at a closed-door Senate lunch.
“This was in response to Mitch McC’s ambush of him at a closed-door Senate lunch.”
Right, I remember that. I think Cruz said that so he wouldn’t be pressured into endorsing Cornyn. But it’s still his choice. To your point, there’s nothing “prohibiting” him from endorsing, if he so chose.