“They have to go!”
That is a LOT MORE than any other Republican has been saying. So they can try to pin him down, but it doesn’t really matter, because there is no one else even bringing up the topic of deportations.
The difference is Trump repeats the slogan “They have to go!” over and over while only barely mentioning the other parts of his comprehensive plan. And if anyone tries to get him to elaborate on the other parts.. He simply repeats the slogan part “They have to go!” over and over or attacks the reporter for having the gall to ask.