Chinese hackers this past summer infiltrated and potentially stole information from the National Association of Manufacturers (NAM), a trade organization and advocacy group that has helped the Trump administration set trade policies with China, Reuters reported this week, citing sources.

A cybersecurity firm hired by NAM made the connection to China based on observed tools and techniques, the report continues. The network has been secured, NAM spokeswoman Erin Streeter told Reuters.

The attackers reportedly ramped up their alleged cyber espionage activity around the time Trump met with NAM President Jay Timmons, and shortly before U.S. and Chinese officials were to commence negotiations on a deal with the two nations, which have been engaged in a trade war.

From Beijing, Chinese Foreign Ministry spokesman Geng Shuang denied the accusations, the report adds.