strong>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."

Also, check out some of the questions and answers with Ben Carson on various databases. Below I'm posting the back-and-forth as reported by the Washington Post's Dave Weigel. If you read it, it's hard to imagine any reporters or either of these candidates have any specific idea in mind when they use the word "database."

The IRS has a database of some sort with all U.S. taxpayers. Can the U.S. government list every citizen? Maybe. How about everyone in the country on a visa? Are these contained in a "database" of some sort? If so, is anyone upset by it?

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