he thinks they already have serial numbers.

not only does he not understand how the process works he either intentionally or out of idiocy mixes up people who immigrate and register at a border with those who aren't registered anywhere and live in the shadows.

msnbc.com/rachel-maddow-show/m…

Why did Trump reference immigrants and ‘their serial numbers’?

Donald Trump apparently believe it'll be easy to deport undocumented immigrants because the local police know of them — and “their serial numbers.” Huh?

^{Steve Benen (MSNBC)}