Beijing (CNN) One of Beijing's top drug officials has rejected allegations by US President Donald Trump that China is to blame for the majority of the supply of the deadly drug fentanyl to the United States.

Liu Yuejin, deputy chief of China's National Narcotics Control Commission, the country's top drug law enforcement agency, said at a press conference in Beijing on Tuesday that the number of investigative leads on fentanyl being trafficked to the US had decreased.

"(There hasn't been) a single lead since May 1. Meanwhile, fentanyl-related deaths in the US have risen further," he said Tuesday.

"These two points clearly show that President Trump's tweets about fentanyl in the US mainly coming from China are not true at all."

Trump has long pressured the Chinese government to take action against imports of fentanyl into the United States. An extremely potent synthetic opioid, 60 times stronger than heroin, fentanyl and its derivatives were behind close to 30,000 of the 72,000 overdose deaths in the US in 2017, according to the National Institute on Drug Abuse.

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