Sen. Tom Cotton (R-Ark.) and Rep. Mike Gallagher (R-Wis.) are raising concerns around U.S. and foreign governments’ potential use of Chinese telecommunications group Huawei’s cloud services, warning of security and privacy issues.

Cotton and Gallagher sent a letter to Secretary of State Antony Blinken on Wednesday detailing their concerns around the use of Huawei cloud services in over 40 countries due to the access it gives the Chinese Communist Party (CCP) to systems, and urging Blinken to ensure that the use of these services does not expand any further.

“Huawei Cloud’s e-Government services promise to help countries streamline document digitization, tax services, national ID systems, elections, and more,” the lawmakers wrote. “However, they also expose Huawei’s clients to the prying eyes of the CCP. When Huawei’s client is a private firm, every one of its customers is at risk.”

“When Huawei’s client is a country, its entire population and political structure sits in the crosshairs,” they wrote.