The White House is concerned that the widely anticipated stop could lead to a crisis in the Taiwan Strait and intensify already fragile U.S.-China relations.
China has issued stern warnings on the stop. According to state television station CCTV, China sent two Su-35 fighter jets across the Taiwan Strait before Pelosi arrived.
The visit was unexpected and is a part of Pelosi's tour of Asia, which also includes stops in Singapore, Malaysia, Japan, and South Korea.