ABC News
Deputy Homeland Security Secretary John Tien, a 24-year Army vet, now finds himself with a new challenge, handed down by Secretary Alejandro Mayorkas specifically because of his background: defeating, disrupting and dismantling Mexican drug cartels. "These cartels are responsible for human smuggling, human trafficking, narcotics trafficking in particular, who are making, shipping and selling dangerous and deadly narcotics," Tien told ABC News in an interview, laying blame with them for the spread of opioids like fentanyl. Tien is one of the most senior law enforcement officials in the country.