Sessions and Homeland Security Secretary Kirstjen Nielsen talked about efforts to disrupt overseas suppliers of heroin and fentanyl, including efforts to prosecute traffickers of any fentanyl-related substance and efforts to work with the governments of Mexico and China to cut off the supply chain. Neilsen said that only about two pounds of illicit fentanyl were seized by Customs and Border Protection in 2013; in 2017, the agency interdicted 1,485 pounds of fentanyl.