Beijing - China has summoned a U.S. envoy in Beijing to protest what it calls “irresponsible words and deeds” on an extradition bill that has triggered massive demonstrations in Hong Kong.

China’s foreign ministry said Vice Foreign Minister Le Yucheng summoned Robert Forden, the U.S. embassy’s deputy chief of mission, on Friday.

The ministry says Le told Forden that external forces should not intervene in Hong Kong’s affairs, which are an internal Chinese matter.

Le urged the U.S. to treat the semi-autonomous region’s government “objectively and fairly.” The statement added that “China will respond further to the U.S.‘s actions.”

U.S. politicians including Nancy Pelosi have expressed support for Hong Kong residents protesting legislation that would allow people in Hong Kong to be sent to mainland China to face charges.