U.S. Commerce Secretary Wilbur Ross signaled on Friday that Washington may flex its muscle with additional trading partners — including Japan — in order to exert pressure on China to open its markets, saying that a "poison pill" provision in the recently completed pact with Canada and Mexico could be replicated.

Ross said in an interview that the provision was "another move to try to close loopholes" in trade deals that have served to "legitimize" China's trade, intellectual property and industrial subsidy practices.

The United States is now in the early stages of talks with Japan and the European Union to lower tariff and regulatory barriers and try to reduce large U.S. trade deficits in autos and other goods.