Ted Cruz believes that not one Republican candidate, including him self will win the 1,237 delegates necessary. He believes that the GOP is heading toward a contested convention, which is is a situation in which no single candidate has secured a majority of overall delegates just using the pledged delegates from popular vote, after the first vote for a political party's presidential candidate at its national nominating convention. Trump, however, completely disagrees. He believes that he is going to the Convention as a winner.
I think that both candidates have reasonable evidence. It would seem very difficult for one candidate to get all the delegates that they need in the time allotted. But on the other hand they have over three months until the National Convention.
In class we watched a Ted talk about how Candidates get delegates with them. They go to states and hold rallies and speeches to try and gain the support of the delegates. This also relates to class because we discussed the Winner- Takes all system which grants it all to the candidate who gets all 1237 delegates first.