[DaveyB]

No, Trump made a pledge to the Republican party

I disagree, it was kinda before God and witness - ie every American and especially every republican voter.

He's calling them out on it ...

He is doing more than exposing their duplicity, he threatening to break a vow and disrupt the election. The hell with the process, if its not the Donald nobody gets to beat Hillary.

...he goes 3rd party (maybe taking Cruz with him)

I would be sorely disappointed in Cruz if he also broke his vow, but it is not his style. Ask Mitch McConnell and Boehner what Cruz does to back stabbing GOPe anti-conservatives. Cruz exposes their treachery and works like the dickens to burn down their corrupt play house by beating them and then beating them out of power.

[Jim Robinson]

It was an agreement. The GOP is in breach of contract if they now try to torpedo their leading candidate. God knows. And so do we the people.

[Finny]

As far as I can discern, Cruz didn't sign any such loyalty pledge. And unless Trump had it stated IN WRITING that the pledge became invalid if he was treated "unfairly," and also had IN WRITING what constitutes "unfair," then he had ZERO business signing it at all.

It was a sham them and it is a sham now.

Handwriting, Wall.