USA military exchanges also have stopped selling smartphones made by ZTE and Huawei Technologies after the Pentagon warned that the devices pose a security risk to military personnel and operations, the defence department said earlier this month.
"Too many jobs in China lost", Trump tweeted.
It's not exactly clear how Trump plans to help ZTE or what he's instructed the Commerce Department to do.
Chinese company was sanctioned for selling phone technology to Iran and North Korea, but Trump now says he will help the firm 'get back into business'.
The president's comments come after the administration banned the sales of USA -made parts to the phone maker ZTE.
"China and the US cooperate in the field of trade, but the talks of past administrations for many years has been one-sided in favor of China". Later, he slapped tariffs on $50 billion worth of Chinese goods.
ZTE has been trying to resolve the blockade that Trump's Commerce Department imposed in April as punishment for violating the terms of a 2017 sanctions settlement, then lying about it.
At the time, the company said it was still assessing the impact of being placed on the Commerce Department's blacklist.
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Companies in the U.S. are estimated to provide up to 30% of the components used in ZTE's products, which includes smartphones and complex equipment for telecommunications networks. This export ban prevents companies from supplying ZTE with parts and technology. And the Federal Communications Commission recently moved toward prohibiting US internet providers that receive federal funds from spending them on equipment made by companies such as Huawei, another major Chinese telecom player.
ZTE's fibre-optic networks depend on United States components and its cheap smartphones sold en masse overseas are powered by USA chips and the Android operating system. Qualcomm and Micron Technology Inc. provided chips.
"Imagine how the United States would feel if China had the power to crush one of our major corporations and make it go out of business", Reade said.
ZTE - Zhongxing Telecommunication Equipment Corporation - is the world's fourth-largest smartphone manufacturer. The order was causing "irreparable harm" to the company and partners, as well as millions of consumers, including those who own its phones and major network operators, the person said.
"This is a fascinating development in a highly unusual case that has gone from a sanctions and export control case to a geopolitical one", Douglas Jacobson told Reuters.
Trump's announcement drew sharp criticism from a Democratic lawmaker, who said the move was jeopardizing US national security.
Adam Schiff, a Democratic congressman from California, responded to Trump's tweet Sunday, saying he "should care more about our national security than Chinese jobs".
"ZTE is undertaking a complete stock take of all units potentially impacted by the Denial Order", Digicel said. Lumentum Holdings and Acacia Communications Inc. sold key optical equipment.