U.S. Trade Representative Robert Lighthizer said Wednesday the administration would likely be unveiling tariffs against China soon, but cautioned that the precise details are still subject to change.

“The president is going to make a decision in the very near future,” Lighthizer told the House Ways and Means Committee. “Our view is that we have a very serious problem of losing our intellectual property, which is really the single biggest advantage of the American economy. … We are losing that to China in ways that is not reflective of the underlying economics.”