In part from Rush Limbaugh:
There are many interpretations and variations of rule 40. For example, it’s not just a candidate has to get 1,237 and if nobody does, it’s wide open. Even at that point, even if nobody gets 1,237, you still have to have won a majority of eight states to be eligible to win the nomination. Did you know that?
However, rule 40 can be changed the day before the convention by the Republican Party. And there is a party convention meeting in April, and if it looks like whatever eventuality is gonna happen, they can easily change that eight states to two. They could change it to four in order to make everybody eligible. Let’s say they want Rubio and Rubio does not win a majority of delegates in eight states. This is not the 20% threshold we’re talking about. We’re talking about a majority. If he doesn’t, then there’s no way that even if Trump doesn’t get to 1,237, there’s no way that Rubio would be eligible, according to rule 40.
However, they can change rule 40 the day before the convention. That’s also in the rule! Rule 40 basically says what it says today, and has the provision that they can rewrite it and say whatever they want it to say the day of the convention or the day before. (interruption) Well, it’s their convention, Snerdley. It’s the Republican Party’s convention. They can write whatever rules they want. And they have given themselves all kinds of outs and latitude and leeway to write new rules whenever they need them. (interruption) It’s exactly right, why they don’t trust — and this is what Cruz is talking about. If they start messing around like this, it’s all over.