WASHINGTON — President Donald Trump said Sunday he has instructed his Commerce Department to help get a Chinese telecommunications company "back into business" after the U.S. government cut off access to its American suppliers.

At issue is that department's move last month to block the ZTE Corp., a major supplier of telecoms networks and smartphones based in southern China, from importing American components for seven years. The U.S. accused ZTE of misleading American regulators after it settled charges of violating sanctions against North Korea and Iran.

President Xi of China, and I, are working together to give massive Chinese phone company, ZTE, a way to get back into business, fast. Too many jobs in China lost. Commerce Department has been instructed to get it done! — Donald J. Trump (@realDonaldTrump) May 13, 2018

ZTE, which has more than 70,000 employees and has supplied networks or equipment to some of the world's biggest telecoms companies, said in early May that it had halted its main operations as a result of the department's "denial order."

Trump, who has taken a hard line on trade and technology issues with Beijing, tweeted on Sunday that he and Chinese leader Xi Jinping "are working together to give massive Chinese phone company, ZTE, a way to get back into business, fast. Too many jobs in China lost. Commerce Department has been instructed to get it done!"

ZTE has asked the department to suspend the seven-year ban on doing business with U.S. technology exporters. By cutting off access to U.S. suppliers of essential components such as microchips, the ban threatens ZTE's existence, the company has said.

During recent trade meetings in Beijing, Chinese officials said they raised their objections to ZTE's punishment with the American delegation, which they said agreed to report them to Trump.

The U.S. imposed the penalty after discovering that Shenzhen-based ZTE, which had paid a $1.2 billion fine in the case, had failed to discipline employees involved and paid them bonuses instead.

Rep. Adam Schiff of California, the ranking Democrat on the House Intelligence Committee, criticized Trump's decision in a reply to his tweet late Sunday.

"Our intelligence agencies have warned that ZTE technology and phones pose a major cyber security threat," Schiff said in the tweet. "You should care more about our national security than Chinese jobs."

Our intelligence agencies have warned that ZTE technology and phones pose a major cyber security threat. You should care more about our national security than Chinese jobs. https://t.co/7Ygh7805jg — Adam Schiff (@RepAdamSchiff) May 13, 2018

Trump later tweeted that while the two countries were working together, past trade negotiations "have been so one sided in favor of China."

"China and the United States are working well together on trade, but past negotiations have been so one sided in favor of China, for so many years, that it is hard for them to make a deal that benefits both countries," he said in the tweet. "But be cool, it will all work out!"