Trumps decisive win Tuesday in his home state of New York makes a contested GOP convention a bit less likely but theres still a solid chance that he wont win a majority of the delegates during the primaries and the candidates will have to scrap it out at the convention to see who comes out on top. If Trump doesnt have a majority of the delegates on the first ballot at the convention a lot of the delegates become unbound on the second round of convention voting meaning they could switch to Cruz or some other figure.
Trump and his followers insist this is wrong that the whole system of candidates persuading delegates to back them on second and subsequent ballots is unfair and that the GOP candidate with the most delegates going into the convention should automatically get the nomination even if that candidate doesnt have an outright majority. But Trump is mistaken and for at least a couple of reasons.
Since Trump may not get the 1237 delegates from state primaries necessary to automatically win the Republican presidential primary there is a chance there will be a contested convention in July. If no candidate reaches the magic 1237 number on the first ballot there will be additional rounds of voting until one finally does reach 1237. After the first vote delegates are freed to vote for other candidates and Cruz appears to be outhustling the great salesman when it comes to wooing delegates.