Chinese officials have long used their willingness to cooperate to stem the flow of fentanyl to the United States as leverage in talks over broader disputes.

Talks continue between the U.S. and China on tackling the fentanyl epidemic amid the bitter trade war between the world’s two largest economies, four U.S. officials familiar with the discussions told Reuters,

China may offer fentanyl measures to spark U.S. trade talks, addressing key issues in supplies and trade tensions with the Trump administration.