The Trump administration has granted an extension for US companies to do business with blacklisted Chinese telecoms group Huawei as regulators continue to hammer out rules on companies that pose national security risks and negotiators strive for progress in trade talks.

The Commerce Department and Bureau of Industry and Security announced on Monday they issued a new 90-day extension allowing US companies “specific, limited engagements” with Huawei and its non-US affiliates.

The Trump administration in May put the Chinese company on an economic blacklist, citing worries the group poses a national security risk. This barred it from buying inputs crucial to the manufacture of its telecommunications equipment, including purchasing semiconductors from US companies, such as Qualcomm, and from using Google’s Android operating system in its smartphones.