President Donald Trump pledged Sunday to help ZTE Corp. "get back into business, fast" after a U.S. ban crippled the Chinese technology company, offering a job-saving concession to Beijing ahead of high-stakes trade talks later this week.

"Too many jobs in China lost. Commerce Department has been instructed to get it done!" Trump wrote on Twitter in the first of two tweets about U.S. trade relations with China. It said he and Chinese President Xi Jinping are working together on a solution for ZTE.

Shortly after Trump's tweet a Democratic lawmaker questioned the move to help the Chinese company, given numerous warnings about ZTE's alleged threat to U.S. national security.