At the same time, the administration continued building border barriers, both physical and electronic, while deporting Mexicans at a record pace.
The expansion of the so-called Schengen zone, where people can travel without showing passports, removed border barriers first in Latvia, Lithuania and Estonia at midnight.
But how do international borders compare to domestic border barriers?
A man hammers away at the Berlin Wall, as the border barrier between East and West Germany was torn down after 28 years, in this Nov. 12 , 1989file picture.
"This is not about a border barrier of several kilometres," he said at a news conference on 28 October.
A border barrier has existed there for decades.
To some, it seems like a no-brainer: By cutting red tape and other administrative barriers at border crossings, a WTO deal on trade facilitation could add $1tn to the global economy, according to the OECD.
The portraits are rendered through a kind of pointillist technique that uses the stamps applied to passports at border crossings to reinforce the idea that music can surmount such barriers.
Four-hour waits at border crossings.
Queues at border crossings.
