WATCH: China warns U.S. House Speaker Nancy Pelosi against visiting Taiwan

China has issued a blunt new warning to Nancy Pelosi, the U.S. Speaker of the House, amid speculations that she could visit Taiwan as part of her trip to Asia.

China claims the island as its own territory, but Taiwan rejects the claim and argues it is a sovereign state.

The spokesperson for China's ministry of foreign affairs said the Democrat speaker's visit will damage relations with the U.S., leading to grave consequences.