The list includes agricultural products, minerals and consumer goods such as handbags, among other items.
The United States began imposing tariffs on $34 billion in Chinese goods at 12:01 a.m. EDT (0401 GMT) on Friday.
"As in the past, the United States is willing to engage in efforts that could lead to a resolution of our concerns about China's unfair trade practices and to China opening its market to U.S. goods and services", he said. "There is no justification for such action".
The move drew immediate condemnation from Senate Finance Chairman Orrin Hatch, a Republican from Utah, who called it "reckless" and not "targeted". The first round of tariffs covered Chinese products ranging from farming plows to machine tools and communications satellites.
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Some countries have already announced retaliatory tariffs and other moves that US industries have said forced them to curb plans for expansion and investments overseas.
Beijing thus far has vowed to respond in kind to any USA trade action.
US President Donald Trump is likely to publish this week a list of $200 billion in additional Chinese products to be hit with tariffs, possibly as early as later on Tuesday, an administration official said. But Trump hasn't backed down, arguing that China's unfair trading practices are hurting American workers.
Chinese officials are expected to retaliate in other ways, hitting US firms in China with unplanned inspections, delays in approving financial transactions and other administrative headaches.
Trump has been considering tariffs against China since his officials concluded in March that Beijing violates USA intellectual-property rights, such as by forcing American firms to hand over technology.