No, you are wrong. If Trump is standing firmly against any increase of immigration, and for deportation of presently undocumented immigrants, his supporters will stand fixedly behind him. There is enough of them to get Trump reelected in 2020.
What we need to talk about is, how we should reform our immigration policy. Here is my concept: https://medium.com/@hak1010/the-freedom-of-migration-act-challenge-4345209bc628.