From The BBC News

Duncan Hunter, who chairs the Armed Services Committee in the House of Representatives, hopes to win enough support to pass a bill in Congress.

Critics of his bill say many immigrants enter the US legally but simply remain in the country when their visas expire. More than 1m Mexicans are stopped from entering the US each year to seek work.

Mr Hunter’s plan for the fence envisages a dual-layer construction equipped with electric sensors stretching from the Pacific Ocean across to the Gulf of Mexico.

The fence would be surrounded by a new border buffer zone to the north and would be studded with 25 new official points of entry along its route.

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