What he's referring to is that China is the biggest supplier of fentanyl and equipment to Mexican cartels that traffic it across the US' southern border. That's

What he's referring to is that China is the biggest supplier of fentanyl and equipment to Mexican cartels that traffic it across the US' southern border. That's where most fentanyl comes from. How a country with such strict drug laws (execution) is the world's number one producer of the deadliest drug... doesn't make sense on face value.