How does a strong nationalist approach not conflict with evangelism?

We are in the middle of a critically important discussion of immigration policy in America. President Trump has put forward an immigration stance that includes 3 important components. (1) End to Visa lottery program, (2) End to chain migration, and (3) A border wall. Some Christians see these policies in conflict with our biblical mandate to evangelize the world. If we keep potential individuals to be evangelized out of our nation, we prohibit a significant opportunity to fulfill that mandate. How is a strong nationalist approach not in conflict with the mandate to evangelize?