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%.

Trump cited the fentanyl issue as the reason for imposing a 10% tariff on all Chinese imports in early February, on top of any existing duties. He doubled that to 20% earlier this month. He also has cited fentanyl, along with other reasons, for imposing tariffs on Canada and Mexico.

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.