392611 05: A United States Customs agent waits for a northbound truck crossing the border to enter the United States from Nogales, Sonora, Mexico, August 1, 2001 near Nogales, AZ. In defiance of veto threats from the White House and warnings from Mexico, the Senate approved a $60.1 billion bill that would subject Mexican truckers to increased inspections, insurance, and other requirements before entering the U.S. (Photo by David McNew/Getty Images)