"We call on our European allies and partners to implement the EU recommendations by adopting strong, risk-based security measures [that] exclude high-risk suppliers from all parts of their 5G networks", Pompeo said, according to a State Department press release.
The United States has taken steps to secure its own 5G network by banning untrusted suppliers, such as the Chinese telecom giants Huawei and ZTE, Pompeo said during a visit to the United Kingdom, according to the release.
"Our actions are in line with the EU’s assessment that 5G suppliers headquartered in countries without democratic checks and balances may pose an unacceptable security risk", Pompeo said.
"Our view of the technology and of the data is that putting this Chinese technology inside of these systems is something that is very difficult to mitigate", Pompeo said, adding that "the United Kingdom came to a slightly different conclusion".
Huawei featured prominently in Pompeo’s meetings with senior UK officials this week, including Prime Minister Boris Johnson, according to the State Department.