Confused talk about 'databases' of Muslims, immigrants, and citizens

CONCORD, N.H. — Does anyone know what they’re talking about when it comes to these weird ideas of “databases” of various groups of people in the U.S.?

Listen to Donald Trump on his apparent Muslim database idea. Sometimes he seems to be talking about all Muslims. Sometimes he seems to be talking about all immigrants. Maybe he’s talking about Muslim immigrants? And what is in this “database”? On Twitter, today, Trump seemed to walk away from the idea, writing, “I didn’t suggest a database-a reporter did.”