LONDON >> Secretary of State Mike Pompeo today made a blistering attack against China as he stepped up pressure on Britain, warning that U.S. intelligence sharing could be risked by the involvement of a Chinese company in a new British telecommunications network.

Speaking in London, Pompeo argued that China posed such a range of economic and security threats that the world now faced “a new kind of challenge, an authoritarian regime that’s integrated economically into the West.”

“China steals intellectual property for military purposes,” he said. “It wants to dominate AI, space technology, ballistic missiles and many other areas.”

The question on the table in Britain is whether the government should allow Huawei, a Chinese company considered a security risk by the United States, to help build some of the next-generation, 5G cellular network in Britain.

Discussions on that topic were the subject of a leak that last week prompted the firing of the British defense secretary, Gavin Williamson, who had opposed working with the Chinese firm.

Huawei denies it is a security risk.

In a speech for the 40th anniversary of Margaret Thatcher’s first election victory, Pompeo asked whether the British leader who came to be known as the Iron Lady would have allowed China “to control the internet of the future.”

Pompeo argued that Chinese law allowed the government to demand access to data flowing through Huawei systems.

“Why would anyone grant such power to a regime that has already grossly violated cyberspace?” he asked. “What can Her Majesty’s government do to make sure sensitive technologies don’t become open doors for Beijing’s spymasters?”

He also issued a stark reminder to his British hosts that if security were compromised, it would restrict the ability of the United States to share sensitive intelligence information with the British, as it does extensively.

“Insufficient security will impede the United States’ ability to share certain information within trusted networks. This is just what China wants — to divide western alliances,” Pompeo said.

Pompeo also said at an earlier news conference, however, that he has “great confidence that the United Kingdom will never take an action that will break the special relationship,” a reference to the close ties of the two nations and a comment that reassured some British officials that damage to relations with the United States can be avoided.

Britain’s foreign secretary, Jeremy Hunt, told reporters that the government had not made its final decision on Huawei, and would never take a decision that would compromise its ability to share intelligence with its closest allies, “or in particular with the United States.”

British officials believe it is possible to give Huawei some access to noncore elements of its new 5G system while maintaining the security of more sensitive networks.

The United States has warned several governments around Europe against working with Huawei, and the topic has become increasingly touchy as countries decide on how to build their 5G networks.

The issue is particularly delicate for a British government that is planning to leave the European Union and wants to forge stronger economic links with China and other Asian economies, while also building on its close diplomatic and trading relationship with the United States.

Williamson was fired last week after an investigation into a report in the Daily Telegraph regarding discussions about the Huawei decision in Britain’s National Security Council, of which Williamson was a member.

The article suggested that May had overruled objections from some Cabinet ministers, including Williamson, about bringing the Chinese company into the 5G project. Williamson has denied being the source of the leak.

In Parliament today, Julian Lewis, a senior lawmaker in May’s Conservative Party and chairman of the House of Commons Defense Committee, asked the prime minister whether it would not “be naïve to the point of negligence to allow Huawei further to penetrate our critical national infrastructure.”

May said she was “not considering any options that would put our national security communications at risk, either within the U.K. or with our closest allies.”

During his visit, Pompeo, who held talks with May and Hunt, also made an apparent swipe at their political adversary, Jeremy Corbyn, the left-wing leader of Britain’s opposition Labour Party. Speaking at his news conference, Pompeo described the support of some politicians for the Venezuelan president, Nicolas Maduro, as “disgusting.”

Unlike the British government, Labour has refused to condemn Maduro, arguing that Venezuela’s political future was a matter for its own citizens. Corbyn, who is no fan of President Donald Trump, has announced that he will not attend an official dinner during Trump’s scheduled state visit to Britain next month.

© 2019 The New York Times Company