A King & Spalding attorney and former chief of staff to the U.S. trade representative under former President Donald Trump offered ways to combat China’s growing abuse of the American intellectual property system to members of a House Judiciary subcommittee Wednesday.

“It’s difficult to overstate the importance of IP for U.S. businesses and workers,” King & Spalding international trade partner Jamieson Greer said before the House Subcommittee on Courts, Intellectual Property and the Internet. He said 40% of U.S. output and the same percentage of jobs is based in America’s IP market and China’s use of the system since it joined the World Trade Organization more than 20 years ago has only gotten worse.