Rand Paul actually said...

Those million people may also include a lot of U.S. citizens who are just coming back from a long-time trip to London.

I think we are wasting resources and not doing good enough police work.

I do not get a good feeling that a decade after September 11, 2001, we know where everyone in the country is who is on a student visa.

Could some of them be potential attackers? The people who attacked us on September 11, 2001, were here on student visas.