U.S. and Mexico weighing deal for Mexico to crack down on fentanyl going north while U.S. cracks down on guns going south

The U.S. is preparing to announce a deal with Mexico to counter fentanyl coming across the southern border, with Mexico cracking down on labs and smuggling while the U.S. does more to stop the flow of U.S. guns into Mexico, two sources familiar with the strategy told NBC News. 

Mexican military and police, with the help of U.S. law enforcement, will focus on tracking raw materials for fentanyl . . .