The hearing coincides with a planned trip to Washington by Chinese President Xi Jinping's top economic adviser for broader trade negotiations.
U.S. Commerce Secretary Wilbur Ross leaves his hotel in Beijing, Friday, May 4, 2018.
"There are many areas where China has promised to do but haven't".
Trump has threatened $150 billion in tariffs on imports of Chinese goods, and China has threatened to retaliate against US exports, including soybeans and aircraft.
George Tuttle III, a lawyer testifying on behalf of the company, said the firm would need to cut 39 people from its 431 employees in Wylie if the tariffs go into effect and defer or cancel additional capital investment.
SolarWorld Americas asked the administration to add solar cells and modules to the list of products the US has proposed for tariffs.
Branstad, who was present at the meeting, said the Chinese appeared to be "taken back" by the significance of the list.
In January, Trump imposed new safeguard tariffs on solar panel imports to protect American manufacturers against cheaper competition, benefiting SolarWorld.More news: Turkey recalls ambassadors to Israel and United States
The Chinese company has called Commerce's punishment excessive and unfair, and has said that they are in compliance with USA law and denies charges that it works with the Chinese government to spy on Americans.
The company shut its main operations after the Commerce Department last month banned US companies from selling components to ZTE for seven years for violating the terms of a settlement deal for illegally shipping goods made with USA parts to Iran and North Korea.
Andrew Harnik/AP Images Instead of divesting from his businesses and placing them into a blind trust, Trump instead made an arrangement prior to taking office that put his two adult sons and a senior Trump Organization executive in charge of his interests, and the president continues to profit from them.
The final terms may still change, as a team led by China's top economic envoy Liu He has just arrived in Washington today for a multi-day trade negotiation with his USA counterparts.
White House economic adviser Larry Kudlow said on Tuesday it was far from certain what steps the US government would take on China's ZTE Corp, which he characterized as an enforcement, rather than trade, issue. The International Monetary Fund has warned that a global trade war could undermine one of the broadest world upswings in years.
"The beating heart of what often is called "Trump Country" would be stifled by the unintended consequences of these tariffs", said Buchzeiger during a hearing Tuesday in Washington on the proposed tariffs. It reported $17 billion in revenue previous year.
After China promised to retaliate with tariffs in kind on soybeans and other US exports, Trump suggested the amount should be raised by $100 billion. "It would be deeply problematic for the national security of the U.S. and ultimately for his hopes of rebalancing America's relationship with china geopolitically, economically, commercially, and certainly on security", Rubio said. "There is no evidence that China has agreed to such a shift in approach", the letter said.
The US is looking for a way to lift a ban on the company in exchange for more imports of American agricultural products by China.