The report cited six people familiar with the Chinese warnings as saying they were significantly stronger than the threats that Beijing has made in the past when it was unhappy with US actions or policy on Taiwan, which is claimed by China.

The private rhetoric suggested a possible military response, the Financial Times cited several people familiar with the situation as saying.

The White House National Security Council and the State Department declined to comment on the report.

China has been stepping up military activity around Taiwan seeking to pressure the democratically-elected government there to accept Chinese sovereignty.

Taiwan’s government says only the island’s 23 million people can decide their future, and while it wants peace will defend itself if attacked.

On July 18, the Financial Times reported that Pelosi plans to visit Taiwan in August.

A day later, China’s foreign ministry said that a visit to Taiwan by Pelosi would seriously undermine China’s sovereignty and territorial integrity, and the US would bear the consequences of its response.

On Wednesday, US president Joe Biden said he plans to speak with Chinese president Xi Jinping by the end of the month. Biden appeared to cast doubt on the reported Pelosi trip to Taiwan.

“I think that the military think it’s not a good idea right now, but I don’t know what the status of it is,” Biden told reporters.