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A U.S. Border Patrol agent patrols near a stretch of the U.S.-Mexico border fence on October 3, 2013 near San Ysidro, California. The fence is double in some areas, while often ceases altogether in deep ravines or mountainous areas. While hundreds of thousands of government workers were furloughed Tuesday, thousands of Border Patrol agents, air-traffic controllers, prison guards and other federal employees deemed "essential" remain on duty, although their pay may be delayed.
Officials announced Wednesday that they had discovered a newly finished tunnel between San Diego and Tijuana, Mexico.
More than 100 tunnels typically used for drug smuggling and human trafficking have been discovered in California and Arizona since the 1990s. Some tunnels are super sophisticated with lighting, hydraulics and rail systems to transport millions of dollars worth of drugs across the border without detection.
Elliot Spagat, San Diego correspondent for the Associated Press, joins the show with more.