Mr. Trump is imposing tariffs to punish China for, he alleges, stealing intellectual property from American companies and forcing them to share sensitive information unfairly.
Martin could be imprisoned for up to 10 years if he is convicted on charges of illegally removing and storing classified materials and stealing government property.
Still the president has long insisted China is cheating the U.S. by stealing intellectual property, manipulating currency and most recently reneging on a framework for a deal.