China's Taiwan Affairs Office threatened retaliation over Taiwan President Tsai Ing-wen's visit to the US on Wednesday. 

Zhu Fenglian, spokesperson of China's Taiwan Affairs Office said at a news conference, “if she contacts US House Speaker McCarthy, it will be another provocation that seriously violates the one-China principle, harms China's sovereignty and territorial integrity, and destroys peace and stability in the Taiwan Strait. We firmly oppose this and will definitely take measures to resolutely fight back."

In response, Reuters cited senior US officials, as saying that “China shouldn't overreact to Taiwan president's transit.”