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The White House has warned China may respond to Nancy Pelosi's mooted visit to Taiwan with military provocations.
This could include firing missiles near Taiwan, or large-scale air or naval activities, spokesman John Kirby said.
Pelosi, the US House of Representatives Speaker, touched down in Malaysia on Tuesday on her tour of Asia.
Taiwanese and US media says she plans to visit Taipei on Tuesday night, but there's been no official confirmation.
However responding to reporter questions on Tuesday, Taiwan's premier Su Tseng-chang said the island "warmly welcomes" any foreign guests.
He added Taiwan "would make the most appropriate arrangements" for any visitors.
Taiwan is a self-ruled island, but claimed by China, which sees it as a breakaway province. Beijing has warned of "serious consequences" if Pelosi visits.
While the US maintains what it calls a "robust, unofficial relationship" with Taiwan, it has formal diplomatic relations with China and not Taiwan.
On Monday, China's United Nations envoy Zhang Jun warned the visit would undermine relations between Beijing and Washington. China's Foreign Ministry also said a Pelosi visit would "constitute a gross interference in China's internal affairs" adding: "Those who play with fire will perish by it".
There is strong bipartisan support for Taiwan among the American public and in the US Congress. And Pelosi, a senior figure in the Democratic Party, has long been a vocal critic of the Chinese leadership, denouncing its human rights record. She has previously met pro-democracy dissidents and visited Tiananmen Square to commemorate victims of the 1989 massacre.
The speaker began her Asia tour on Sunday by flying to Singapore. Her public itinerary also included stops in Malaysia, South Korea and Japan - but did not mention Taiwan.
Pelosi originally planned to visit Taiwan in April, but postponed the trip after she tested positive for Covid-19.
Earlier this month she said it was "important for us to show support for Taiwan".
Source: BBC
