Speaking in Hungary, the first stop on a five-nation European tour, Pompeo said that the United States has an obligation to remind other governments of the dangers of building networks with equipment from giant telecommunications of China.
"What we need is that we share with them the things we know about the dangers that the presence of Huawei in their network is presenting," he said. "Actual risks to their own people, in the absence of privacy protections for their own people, are the danger that China will use this data in a way that is not the best interest of Hungary."
If the countries use the Huawei device, "it's harder for us to partner with them," Pompeo said.
The US government has long been suspicious that Beijing may use Huawei's equipment for surveillance but does not provide public evidence to support those concerns. Washington now continues in countries around the world to keep Huawei in the next generation of wireless networks, known as 5G.
There is a particular concern about 5G security as it will be used to bring a vast amount of data that can connect to robots, autonomous vehicles and other potentially sensitive devices.
Huawei, one of the world's leading smartphone manufacturers, has repeatedly denied that its products prove a national security risk. It also maintains that it is a privately owned company with no relationship with the Chinese government.
Huawei's uncertainty around Europe
Huawei has largely closed the American market, but the company has a significant business in Europe where it has 40% of the market of equipment telecommunications.
Washington strives to tighten the grip.
Global mobile carrier Vodafone ( VOD ) said late last month that it was suspending the deployment of Huawei core network equipment in Europe, surrounding the Chinese company.
In the United Kingdom, Huawei has spent $ 2 billion in efforts to address security concerns by government agencies. The operator of telecommunications BT ( BT ) said it does not purchase Huawei devices for the core of its 5G network but continues to use it for other parts, such as mobile base stations.
German Chancellor Angela Merkel said last week that "there are major discussions about Huawei" in Germany while the country is building a 5G network. "We need to talk to China to make sure companies do not just give up all the data used in the Chinese state," he said, adding that "safeguards" are needed to protect data.
What will Canada do?
Two close US allies outside Europe leave Huawei. Australia and New Zealand restricted the company last year from providing equipment for the 5G network.
Huawei pushed against the so-called "irresponsible decisions" of some of the nations it says is based on "ideological and geopolitical considerations "rather than legitimate concerns about technology.
Canada considers similar measures to restrict Huawei even if it walks the geopolitical tightrope between Washington and Beijing. The Canadian police detained Huawei's Chief Financial Officer Meng Wanzhou in December on behalf of US authorities. Meng is the daughter of Huawei founder Ren Zhengfei.
His arrest had a serious strained relationship between China and Canada.
The US Department of Justice is seeking extradition by Meng, accusing him and Huawei of bank fraud and violating US penalties on Iran. Meng and Huawei declined the charges.