Washington last week effectively banned U.S. firms from doing business with Huawei, the world's largest telecoms network gear maker, citing national security concerns.

"You look at what they've done from a security standpoint, from a military standpoint, it's very dangerous," the U.S. president said in remarks at the White House. "If we made a deal, I could imagine Huawei being possibly included in some form or some part of it."

Trump predicted a swift end to the trade war with China, although no high-level talks have been scheduled between the two countries since the last round of negotiations ended in Washington two weeks ago.

Shares of S&P technology and industrial companies, bellwethers of trade sentiment, fell more than 2% on Thursday as the market slumped in a sign the conflict was being seen as a battle not just over trade but also about who controls global technology.

Earlier on Thursday, U.S. Secretary of State Mike Pompeo accused the chief executive of Huawei, Ren Zhengfei, of lying about his company's lack of ties to the Beijing government, which he said represented a security risk.

"The company is deeply tied not only to China but to the Chinese Communist Party. And that connectivity, the existence of those connections puts American information that crosses those networks at risk," he said.

Huawei has repeatedly denied it is controlled by the Chinese government, military or intelligence services.

Chief Financial Officer Meng Wanzhou, who is Ren's daughter, was arrested in Canada in December and faces extradition to the United States on charges she conspired to defraud global banks about Huawei's relationship with a company operating in Iran. She and the company deny the charges.

Tech companies around the world have fallen in line with U.S. curbs on the company. Japanese conglomerate Panasonic Corp said it had stopped shipments of some Huawei components, a day after British chip designer ARM did the same, potentially crippling the Chinese company's ability to make new chips for smartphones.

Asked if he believed more firms would stop working with Huawei, Pompeo told CNBC in an interview Thursday: "We do. We've been working at the State Department to make sure that everyone understands the risks.

U.S. Help for Tech Firms, Farmers

U.S. lawmakers moved on Wednesday to provide about $700 million in grants to help U.S. telecoms providers with the cost of removing Huawei equipment from their networks, and to block the use of equipment or services from Huawei and Chinese telecoms firm ZTE in next-generation 5G networks.

On Thursday, China's Commerce Ministry hit back.

"If the United States wants to continue trade talks, they should show sincerity and correct their wrong actions. Negotiations can only continue on the basis of equality and mutual respect," spokesman Gao Feng told a weekly briefing.

"We will closely monitor relevant developments and prepare necessary responses," he said, without elaborating.

Trump hiked tariffs on $200 billion worth of Chinese goods on May 10 and threatened to slap tariffs of up to 25% on an additional list of Chinese imports worth about $300 billion, prompting China to respond with levies of its own.

Sources have said the trade talks stalled after China tried to delete commitments from a draft agreement that its laws would be changed to enact new policies on issues from intellectual property protection to forced technology transfers.

With no resolution in sight, U.S. Agriculture Secretary Sonny Perdue on Thursday announced a $16 billion aid program to help U.S. farmers hurt by the conflict, with some funds to be used to open markets outside China to U.S. products. Farmers have been among those hardest hit by the trade war.

Retailers, including Best Buy Co Inc and Walmart Inc., are also warning that the tariffs will raise prices for consumers. The newest round will cost the typical American household $831 annually, according to research Thursday from the Federal Reserve Bank of New York.

Of a list of 20 companies compiled by Goldman Sachs that derive a substantial portion of their sales from China, the average stock price decline since Trump's tweet on May 5 signaling that tariff increases were coming is nearly 15% compared with a 4.5% drop for the wider S&P 500 Index.

Trump has embraced protectionism as part of an "America First" agenda aimed at rebalancing global trade.

He is expected to meet Chinese President Xi Jinping at a G20 summit in Japan June 28-29, around the time when the next levies could be ready, according to U.S. Treasury Secretary Steven Mnuchin's calculations.

REUTERS