Top US lawmakers are urging the Biden administration to put Chinese semiconductor company Yangtze Memory Technologies Co on a blacklist for allegedly violating export controls by supplying Huawei.

Democratic Senate majority leader Chuck Schumer told the Financial Times that he was concerned about a report, obtained by the FT, that showed YMTC has provided Nand memory chips for the Mate Xs 2, the new flagship foldable phone from Huawei, the Chinese telecoms equipment giant.

“This report is extremely troubling and further underscores the need for the administration to act swiftly to add YMTC to the entity list,” Schumer said, in a reference to the commerce department blacklist that effectively bars US companies from selling technology to groups on the list.