Fentanyl is an opioid drug more potent than heroin. (Photo: Chip Somodevilla/Getty Images)
President Trump tweeted this morning that China's commitment to curtail fentanyl exports to the U.S. will have "incredible" results, although China has made a similar pledge before and experts say tackling the issue is complicated.
Between the lines: If China does take meaningful steps to crack down on fentanyl coming into the U.S., it could reduce the supply of the powerful drug in the U.S. Fentanyl, which is more potent than heroin, is a major contributor to opioid overdose deaths.