Sen. Ed Markey, D-Mass., is spearheading the unannounced delegation. The group of lawmakers will see Taiwanese officials throughout Sunday. China has slammed such visits in the past, but has not offered a statement on Markey's group.
Other members of the delegation include Democratic Reps. John Garamendi of California, Alan Lowenthal of California, and Don Beyer of Virginia, and Republican Rep. Amata Radewagen of American Samoa.
"Senator Ed Markey (D-MA), Representative John Garamendi (D-CA), Representative Alan Lowenthal (D-CA), Representative Don Beyer (D-VA), and Representative Aumua Amata Coleman Radewagen (R-AS) will visit Taiwan from August 14-15, 2022, as part of a larger visit to the Indo-Pacific region," the American Institute in Taiwan said in a statement. "The delegation will meet with senior Taiwan leaders to discuss US-Taiwan relations, regional security, trade and investment, global supply chains, climate change, and other significant issues of mutual interest," it added.
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Taiwan's foreign ministry hailed the delegation's visit as another sign of warm ties between Taipei and Washington.
"The Ministry of Foreign Affairs expresses its sincere welcome (to the delegation)," the ministry said in a statement Sunday.
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"As China is continuing to escalate tensions in the region, the US Congress has again organized a heavyweight delegation to visit Taiwan, showing a friendship that is not afraid of China's threats and intimidation, and highlighting the US' strong support towards Taiwan." The delegation will meet President Tsai Ing-wen and attend a banquet hosted by Foreign Minister Joseph Wu during the visit, the ministry added.
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"The two sides will extensively exchange views on issues such as Taiwan-US security and trade relations," it said.
China has long claimed Taiwan as its territory, despite the island being democratic and self-governed.
The Chinese military maintained extensive live-fire exercises around Taiwan in the week following Pelosi's visit to the island.
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The Chinese regime claims the top-level visits violate the U.S. "One China" policy, which states that the U.S. acknowledges the People's Republic of China as the one and only government of China.
Pelosi was the highest-level U.S. official to visit Taiwan since House Speaker Newt Gingrich in 1997.
A group similar to Markey's delegation also made a surprise landing in Taiwan in April, including Republican Sens. Lindsey Graham of South Carolina and Ben Sasse of Nebraska.