Rand Paul actually said...

The thing I am still concerned about is, once people enter the country, how do we know if they are overstaying their visas?

I am concerned about the lawlessness south of our border and the extent to which that lawlessness creeps across the border.

Corruption of our law enforcement personnel is a problem, but I am also worried about their physical safety.

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