(CNN) — US House Speaker Nancy Pelosi landed in Taipei on Tuesday, marking a significant show of support for Taiwan despite China’s threats of retaliation over the visit.

Pelosi’s stop in Taipei is the first time that a US House speaker has visited Taiwan in 25 years. Her trip comes at a low point in US-China relations and despite warnings from the Biden administration against a stop in Taiwan. A Taiwanese official told CNN that Pelosi is expected to stay in Taipei overnight.

Pelosi and the congressional delegation that accompanied her said in a statement on Tuesday that the visit “honors America’s unwavering commitment to supporting Taiwan’s vibrant democracy.”

“Our discussions with Taiwan leadership will focus on reaffirming our support for our partner and on promoting our shared interests, including advancing a free and open Indo-Pacific region,” the House speaker’s statement said. “America’s solidarity with the 23 million people of Taiwan is more important today than ever, as the world faces a choice between autocracy and democracy.”

The House speaker wrote an op-ed that published in The Washington Post after she landed Tuesday, arguing that her trip demonstrated the US commitment to Taiwan under threat from China. “In the face of the Chinese Communist Party’s accelerating aggression, our congressional delegation’s visit should be seen as an unequivocal statement that America stands with Taiwan, our democratic partner, as it defends itself and its freedom,” Pelosi wrote.

Pelosi is traveling with House Foreign Affairs Chairman Gregory Meeks of New York, Veterans’ Affairs Chairman Mark Takano of California and Reps. Suzan DelBene of Washington state, Raja Krishnamoorthi of Illinois and Andy Kim of New Jersey.

Pelosi’s stop in Taiwan was not listed on the itinerary of her congressional visit to Asia, but the stop had been discussed for weeks in the leadup to her trip. The potential stop prompted warnings from China as well as the Biden administration, which has briefed the speaker about the risks of visiting the democratic, self-governing island, which China claims as part of its territory.

On Monday, China warned against the “egregious political impact” of Pelosi’s visit, saying that the Chinese military “won’t sit by idly” if Beijing believes its “sovereignty and territorial integrity” is being threatened.

China’s Ministry of Foreign Affairs released a statement after Pelosi landed, charging that her visit “has a severe impact on the political foundation of China-U.S. relations, and seriously infringes upon China’s sovereignty and territorial integrity.”

“It gravely undermines peace and stability across the Taiwan Strait, and sends a seriously wrong signal to the separatist forces for ‘Taiwan independence,'” the foreign ministry said. “China firmly opposes and sternly condemns this, and has made serious démarche and strong protest to the United States.”

Secretary of State Antony Blinken said Monday that the decision to visit Taiwan was the speaker’s, noting there was past precedent of members of Congress — including previous House speakers — visiting. “Congress is an independent, coequal branch of government,” Blinken said in remarks at the United Nations. “The decision is entirely the speaker’s.”

White House officials also warned Beijing on Monday not to take any escalatory actions in response to Pelosi’s trip.

“There is no reason for Beijing to turn a potential visit, consistent with long standing US policy, into some sort of crisis or conflict, or use it as a pretext to increase aggressive military activity in or around the Taiwan Strait,” National Security Council Strategic Coordinator for Communications John Kirby told reporters on Monday.

US President Joe Biden has said publicly that the US military did not believe it was a good time for Pelosi to visit Taiwan, but he stopped short of telling her directly not to go, two sources previously told CNN.

The issue of Taiwan remains among the most contentious in US-China relations. Biden and his Chinese counterpart, Xi Jinping, discussed it at length during a phone call last week that lasted more than two hours.

Administration officials are concerned that Pelosi’s trip comes at a particularly tense moment, as Xi is expected to seek an unprecedented third term at the upcoming Chinese Communist Party congress. Chinese party officials are expected to begin laying the groundwork for that conference in the coming weeks, putting pressure on the leadership in Beijing to show strength.

While Biden has not endorsed Pelosi’s visit, US officials believe Chinese leadership may be conflating the House speaker’s trip with an official administration visit, and they’re concerned that China doesn’t separate Pelosi from Biden, much, if at all, since both are Democrats.

Pelosi has long been a China hawk in Congress. She’s previously met with pro-democracy dissidents and the Dalai Lama — the exiled Tibetan spiritual leader who remains a thorn in the side of the Chinese government. She also helped display a black-and-white banner in Beijing’s Tiananmen Square two years after the 1989 massacre, and in recent years she’s voiced support for the pro-democracy protests in Hong Kong.

This story is breaking and will be updated.

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