You don't understand that Trump and Kobach want far more info that you can imagine. Kobach was the guy who forced tens of thousands of young Muslim males to come in for questioning, and who made up a list of Muslims. Remember what Rev. Martin Niemöller wrote. He is perhaps best remembered for the quotation:

First they came for the Socialists, and I did not speak out—
Because I was not a Socialist.

Then they came for the Trade Unionists, and I did not speak out— 
Because I was not a Trade Unionist.

Then they came for the Jews, and I did not speak out— 
Because I was not a Jew.

Then they came for me—and there was no one left to speak for me.