US President Joe Biden says the US will defend Taiwan if China attacks
But a White House spokesman later told some US media outlets that his remarks did not signify a policy change.
The US has a law that requires it to help Taiwan defend itself.
But it pursues a policy of "strategic ambiguity," where it is deliberately vague about what it would do if China were to attack Taiwan.
China has yet to respond to Mr Biden's comments.
Mr Biden responded: "Yes and yes." He added there was no need to "worry about whether they're going to be more powerful" because "China, Russia and the rest of the world know we're the most powerful military in the history of the world".
He was then queried a second time by anchor Anderson Cooper if the US would come to Taiwan's defence in an attack by China. Mr Biden replied: "Yes, we commit to doing that."
A White House spokesperson later appeared to walk back Mr Biden's comments, telling US media outlets that the US was "not announcing any change in our policy and there is no change in our policy".
It is not the first time this has happened. In August, Mr Biden appeared to suggest the same stance on Taiwan in an interview with ABC News. The White House had also said then that US policy on Taiwan had not changed.
The US has no official diplomatic ties with Taiwan but sells arms to it as part of its Taiwan Relations Act, which states that the US must provide the island with the means to defend itself.
It has formal ties with China and diplomatically acknowledges China's position that there is only one Chinese government.
Taiwan's presidential office has said it would neither give in to pressure nor "rashly advance" when it gets support.
"Taiwan will show a firm determination to defend itself," said presidential spokesperson Xavier Cheng, who also went on to acknowledge the Biden administration's continued show of "rock-solid" support for Taiwan.
China has not yet responded. But earlier on Thursday, before Mr Biden's town hall, China's UN ambassador Zhang Jun accused the US of "taking dangerous actions, leading the situation in the Taiwan Strait into a dangerous direction".
In recent weeks tensions have been rising between Taiwan and China after Beijing flew dozens of warplanes into Taiwan's air defence zone.
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