President Donald Trump’s executive order imposing an across-the-board 10% tariff on all US imports from China went into effect. A month later, he doubled it to 20%.

Officials from China’s Foreign Ministry and the Ministry of Public Security said in a briefing the country has achieved success in controlling the drugs and done all it can for the U.S.

China has taken multiple steps to control the illegal fentanyl trade, responding to concerns raised by the U.S. government. Fentanyl, a powerful synthetic opioid, has been linked to a rising number of overdose deaths in the U.