Labrum - a cover which may be loosely referred to as the upper lip. Mandibles - hard, powerful cutting jaws. Maxillae - 'pincers' which are less powerful than the mandibles. They are used to steady and manipulate the food. Labium - the lower cover, often referred to as the lower lip.
The President, as head of the federal executive branch, is ultimately in charge of enforcing the immigration laws of the United States. In turn, he must make discretionary decisions about whether and when to prosecute immigration law violators through deportation and other sanctions.
U.S. Citizenship and Immigration Services (USCIS), services formerly carried out by Immigration and Naturalization services (INS); U.S. Immigration and Customs Enforcement (ICE) which is responsible for enforcing immigration and customs laws within the U.S., but is not concerned with border enforcement. U.S. Customs and Border Protection (CBP) which is responsible for border protection through the 20,000 member Border Patrol. Focuses on entry points such as border crossings, airports, and ports. CBP is building a fence in the southwestern U.S. and has increased the speed with which unauthorized aliens are removed.