Mr Lighthizer said in a statement that he was taking such action at the direction of President Donald Trump.
And this year's G20 host Argentina is enduring its own economic crisis, necessitating the deployment of more than 22,000 police against the threat of mass protests when the heads of government convene on Friday and Saturday.
A U.S. official said there were no plans for a joint press conference or a joint statement, adding that it would be up to the two leaders to give their impressions of the discussion separately. But he said the White House has been disappointed so far in the Chinese response to trade issues. "And I would expect that to be the case again".
Strong economic growth in the US may protect workers initially, but as more tariffs are officially imposed, the number of unemployed persons will likely grow.
Meanwhile, talks are going on to further open China's market to other Argentine goods, including lamb, pork, honey, wheat and cherries.
Putin would be one of several leaders to meet the Saudi prince, who is also expected to hold talks with Turkish President Recep Tayyip Erdogan and United Nations chief Antonio Guterres.
And there's climate change.
Trump has also foreshadowed imposing tariffs on the remaining US$267 billion of China's exports to the US. That's when China - you can look at - they were - they were flatlining for many years, and then they went like a rocket ship up the day they signed the World Trade, he said.
Trump spoke to Wall Street Journal reporter Bob Davis earlier this week about U.S.
At the same time, the Trump-Xi summit is still shrouded in secrecy despite its importance.
Trump's administration is mulling whether to apply fresh tariffs on imported autos under national-security grounds, as it did on steel and aluminum imports this year. He adds: "That will be very determinative", Trump said. "Maybe I won't have the meeting", he said. On Monday, Trump did not explicitly criticize Russia's behaviour, leaving it to U.N. Ambassador Nikki Haley to speak out against Russia's aggression. Trump wants the iPhone made domestically, a massive supply-chain realignment that Apple executives and economists say is not practical.
White House economic adviser Larry Kudlow on Tuesday dangled the possibility of a "breakthrough" at the dinner. "Any country controlling a strait could be tempted to forbid passage".
Trump said that the trade with China has been a bad one-way street with a deficit of at a minimum $375 billion a year.
"Xi Jinping is under extreme pressure to get a deal with Trump, so I think the Chinese will make some concessions", Dr. Willy Wo-lap Lam, an adjunct professor at the Chinese University of Hong Kong and a leading expert on Chinese elite politics, told ABC News, referring to the weight placed on Xi by senior party officials.
- Ball not aware of his greatness - LeBron
- General Motors set to end factory operations in Oshawa
- Spanish PM announces deal on Gibraltar ahead of Brexit summit
- Jose Mourinho: 'Alexis Sanchez not leaving'
- Second CRISPR-Modified Pregnancy May Be Underway
- Saudi crown prince arrives in Tunisia amid protests
- Range Rover Evoque Unveiled, India Launch Likely In 2019
- Australia to face England in Final
- Pelosi Clears First Hurdle For Speakership
- U.S. doctor warns against backlash to gene-edited baby claim