In the separate dispute about steel and aluminium tariffs, he also has to contend with the politically targeted retaliation that other countries such as Mexico, Canada and the European Union have in hand, meant to hit important states in the mid-term elections.
Brown also said that there are no signs of the two nations resuming their stalled trade talks "in just about every level".
China's proposed retaliatory tariffs on the United States target farm goods such as soybeans, as well as chemicals, oils and seafood.
Neither side has yet imposed tariffs on the other in their growing dispute over technology and the US trade gap; the first round is to take effect on July 6.
With the world's two largest economies already engaged in a confrontation long feared by markets and industry, Trump said he was pushing forward with fresh punitive measures over Beijing's "unacceptable" move to raise its own tariffs. "On average, semiconductor and semiconductor equipment companies get 52 percent of their revenue from China, according to a recent report from Morgan Stanley", CNBC reports. "These tariffs are essential to preventing further unfair transfers of American technology and intellectual property to China, which will protect American jobs", the president said at the time.
The proposed measures caused upset on global stock markets on Tuesday, initially weakening both the United States dollar and the Chinese yuan. Earlier, the S&P 500 Index posted a small retreat and Treasury yields were little changed after trading near the lowest this month. Boeing's stock shed 4.3 percent, Caterpillar 4 percent and GE 2.2 percent.
The Commerce Ministry criticized Trump's order to prepare tariffs on $200 billion of Chinese goods as blackmail.
The US "practice of extreme pressure and blackmail departed from the consensus reached by both sides during multiple negotiations and has also greatly disappointed worldwide society", China's commerce ministry said in a statement on its website.
Saudi Arabia players face 'penalty' after disastrous World Cup defeat
The team says Dzagoev underwent an MRI scan on Friday and "a timeframe for his treatment will be determined in the coming days". They are due to face seven-time African Cup champions Egypt and Uruguay.
Messi misses PK as Argentina draws Iceland
To further compound their problems, goalkeeper Sergio Romero and midfielder Manuel Lanzini both fell victim to late injuries. But the Icelanders revel in their underdog status and showed at Euro 2016 they will not be cowed on the big stage.
Opec to raise oil supply in 2018 second half
Nigeria's production plunged 150,000 b/d in the month to 1.73 million b/d, a one-year low, according to the survey by Platts. Oil prices ticked higher Thursday after data showed a decline in US petroleum inventories.
"If the US side becomes irrational and issues the list, China will have to adopt comprehensive measures in quantity and quality in order to make strong countermeasures", said the statement.
China has threatened "qualitative" as well as "quantitative" moves if the dispute worsens, meaning it could use inspections of goods, visa applications and other regulatory measures to make life more hard for United States companies doing business in China.
Pompeo on Monday described USA actions as "economic diplomacy, " which, when done right, strengthens national security and worldwide alliances, he added.
"As I've said from the beginning, China will back off its industrial plans only when U.S. trade measures are large and lasting enough to threaten the influx of foreign exchange", he said. In 2017, the U.S. trade deficit with China was a record $375.2 billion, but that did not include services.
Worries about a growing U.S.
China's Government denounced Mr Trump's threat and warned it would respond with "strong countermeasures".
The White House said it would consult on tariffs on the other $16bn of products, and would apply these later. Last week he threatened 25 percent tariffs on $50 billion in Chinese products with another $100 billion targeted beyond that. The White House is finalizing a list of $16 billion in additional goods it will sanction later.
China retaliated with $50 billion worth of US exports, including agricultural products.
Beijing wants to "demonstrate that things will be done their way or not at all", said Christopher Balding, an economics professor at Shenzhen's HSBC Business School, who believes Chinese policymakers prefer demonstrations of "power and control" over "technical policy rightness".