"It's a horrible epidemic, but it's an epidemic that's been unleashed on purpose by the Sinaloa and the new generation Jalisco cartels," Garland said.

Graham then pressed Garland about what Mexico was doing to combat drug trafficking.

"They are helping us, but they could do much more. There's no question about that," Garland responded.

BORDER PATROL SEIZES ENOUGH FENTANYL TO KILL 100 MILLION AMERICANS IN UNDER FIVE MONTHS

This is a developing story. Check back soon for updates.