A report by the Congressional Research Service proves that China has paid the U.S. during the trade regimes between them over the past three decades.
According to the Congressional Research Service report titled 'China-U.S. Trade Issues' published by the Federation of American Scientists (FAS), economic and trade reforms between China and the United States began in 1979. It adds that China has been the United States' largest merchandise trading partner and that it has significantly liberalized its economic and trade regimes over the past three decades. The total U.S.-China merchandise trade price had risen from $2 billion in 1979 to $636 billion in 2017.
Therefore, it is proven that China has paid in customs duties during the previous administrations of the U.S. government.