beijing china drug control agency dispute friday u.s. president donald trump claim synthetic drug fentanyl heart u.s. opioid crisis produce china declare crisis public health emergency u.s. president donald trump say last week would discuss top priority stop flood cheap deadly fentanyl manufacture china meet president xi jinping state visit beijing next week wei xiaojun deputy secretary-general china national narcotics commission say china deny reject fentanyl produce china make way unite state intelligence information exchange china unite state enough say fentanyl opioid substances originate china wei say joint news brief u.s. drug enforcement administration dea beijing opioids include prescription painkillers heroin fentanyl highly addictive synthetic drug 50 100 time potent morphine center disease control estimate 20,000 americans kill fentanyl last year surpass common painkillers heroin first time american law enforcement agencies drug control experts say fentanyl distribute unite state well precursor chemicals originate china chinese officials dispute claim beijing take step crack production export synthetic drug place fentanyl 22 relate compound list control substances do even though fentanyl widely abuse china wei say primarily spirit cooperate unite state broad international community china unite state increase cooperation drug control recent years hold bilateral meet issue week dea open second country office southern guangzhou january lance ho head dea country office beijing say cooperation two countries generate good momentum focus improve real-time share information china control substance dramatic effect unite state term live save ho say u.s. department justice indict two major chinese drug traffickers last month charge make illegal versions fentanyl sell highly addictive drug americans internet international mail wei say regrettable unite state decide announce case unilaterally would affect china ongoing investigations china dispute trump 's claim fentanyl 'flood unite state