Border security is a crucial part of the immigration overhaul creeping forward on Capitol Hill, says Stateline. The government has built 651 miles of fencing along the border–about three times what existed six years ago. The U.S. operates hundreds of remote cameras, more than 13,000 ground sensors, and five drones in the area. The Border Patrol force has doubled in the last decade, to more than 18,000. Those steps, together with the sluggish economy and record-high deportations, have slowed the flood of people trying to enter the U.S. illegally to a trickle. Still, border-state governors say the federal government must do more. If the immigration overhaul pending in the Senate becomes law, governors of those states will play a crucial role in determining how much border security is enough. The measure the U.S. Senate is considering would require the federal government to stop 90 percent of people who try to enter the U.S. If it cannot meet that threshold in five years, border governors would help decide how to meet it. The governors also would be allowed to deploy the National Guard for border security-related missions.