This view of the Constitution has been rejected by the federal courts, which consistently have held that under the Constitution, the states do not have the power to nullify federal laws. The courts have rejected the compact theory, finding that the Constitution was not a contract among the states.
A U.S. Border Patrol agent in San Diego has been arrested for hiding his undocumented father and other people in the U.S. illegally.
Different countries use varying terms for aliens including: 1  an illegal immigrant, illegal alien or undocumented alien is person who is residing on a non-temporary basis in a country where s/he has no legal right to reside. 2  a legal alien is a non-citizen who is legally permitted to remain in a country.