China said on Monday that its military "not sit idly by" if US House of Representatives Speaker Nancy Pelosi visits Taiwan.
The latest warning was issued during a Chinese foreign ministry regular briefing. Spokesperson Zhao Lijian also said that because of Ms Pelosi's status as the "No 3 official of the US government", a visit to Taiwan, which China claims as its own, would "lead to egregious political impact".
Ms Pelosi was set to kick off a tour of four Asian countries on Monday in Singapore amid intense speculation that she may risk the wrath of Beijing by also visiting self-ruled Taiwan.
Ms Pelosi met prime minister Lee Hsien Loong, president Halimah Yacob and other cabinet members, Singapore’s Foreign Ministry said.
Mr Lee welcomed a US commitment to strong engagement with the region, and the two sides discussed ways to deepen economic engagement through initiatives such as the Indo-Pacific Economic Framework, the ministry said in a statement.
Mr Lee and Ms Pelosi also discussed the war in Ukraine, tensions surrounding Taiwan and mainland China, and climate change, it said.