The next round of China-U.S. trade talks will get under way in Beijing this week with significant issues still unresolved but with enforcement mechanisms “close to done,” U.S. Treasury Secretary Steven Mnuchin said.

“There are still some important issues. We still have more work to do,” Mnuchin said in an interview on Fox Business. “If we get to a completed agreement it will have real enforcement provisions,” adding that those provisions are “close to done” and only need “a little...