It&#x27;s more of a practical problem: if you&#x27;re trying to deport someone forcibly, they still need to go through immigration in the country they&#x27;re being deported to, and you need to establish somehow <i>which</i> country to deport them to without their cooperation. This has caused problems for some European deportations. I believe at the moment Mexico accepts US deportees, but they don&#x27;t <i>have</i> to make it easy for the US to dump a load of people at the border saying &quot;these guys look Mexican, you can have them back&quot;.<p>Anyway, it contravenes the 14th Amendment.<p>(The EU has article 8 instead, which means that in practice you have to deport a whole family or not at all).