Officials at the G-7 meeting expressed concerns to Treasury Secretary Steven Mnuchin about the damaging effects of a trade war, but the issue wasn't advanced much, the person said. A Treasury spokesman declined to comment on the matter.
In a statement Friday, Mnuchin said the IMF should be a "strong voice" for its members to dismantle trade and non-tariff barriers and to protect intellectual property rights.
"We strongly believe that unfair global trade practices impede stronger U.S. and global growth, acting as a persistent drag on the global economy," he wrote in a statement.
"Ensuring that trade is free, fair, and reciprocal will boost global trade and support stronger, more sustainable growth."
But even as they meet, tensions seem to be escalating. Earlier Thursday, Heath Tarbert, an assistant secretary to the Treasury Department's international affairs office, said the U.S. is considering using an emergency law to curb Chinese investments in sensitive technologies.
It's one of the options the Trump administration is looking at to punish China for what it sees as violations of American intellectual-property rights.
Beijing fired back forcefully on Friday. "The U.S. is thinking and acting like a bully," foreign ministry spokeswoman Hua Chunying said at a daily briefing.
Pressure is also building on China to do more to open up its economy.
"We also do understand the frustration," of the U.S., Hammond said. "China is not as open an economy as we would like it to be and one of the things that I've been focusing on this week is trying to persuade China to take positive actions to open its economy."