States have the sovereign right to control their own borders.  All states have sovereignty– the supreme authority within a territory 1.This includes the supreme authority to decide who should be allowed into and out of the country. Illegal immigrants have breached that sovereignty by arriving uninvited and attempting to circumvent checks. These people should be deported in order to maintain the sovereignty of the nation. The United Nations recognises the sovereign rights of members when it says “Nothing contained in the present Charter shall authorize the United Nations to intervene in matters which are essentially within the domestic jurisdiction of any state."2 Who is allowed to be resident in the state is an internal consideration.  1. Stanford Encyclopedia of Philosophy, 2010,   2. Article 2, UN Charter,