China said on Monday that its military “not sit idly by” if U.S. House of Representatives Speaker Nancy Pelosi visits Taiwan.

The latest warning was issued during a Chinese foreign ministry regular briefing. Spokesperson Zhao Lijian also said that because of Pelosi’s status as the “No. 3 official of the U.S. government”, a visit to Taiwan, which China claims as its own, would “lead to egregious political impact”.