In addition to complete elimination of the extradition law, Hong Kong's protesters are demanding the authorities stop referring to them as "rioters", to drop criminal charges against those arrested; to conduct an independent inquiry into police brutality and to allow universal suffrage for the Legislative Council and chief executive.
On Tuesday, Chinese Vice Premier Liu He and his USA counterparts, Trade Representative Robert Lighthizer and Treasury Secretary Steve Mnuchin, spoke on the phone to discuss trade negotiations, according to China's Ministry of Commerce.
Pro-democracy activists are calling the move a "timely Thanksgiving present".
"I and my government are listening to our people with a view to resolving some deep-seated problems in Hong Kong through dialogue", she said.
Police entered the grounds on Thursday to collect evidence, and remove unsafe items from the campus.
The democracy law states that it is US policy to reaffirm the 1992 Hong Kong policy law including support for democratization in Hong Kong. More than 5,000 people have been detained since the discord began.
Hong Kong's government also denounced the move, adding that it sent the wrong signal to protesters.
China denies interfering and says it is committed to the "one country, two systems" formula put in place at that time and has blamed foreign forces for fomenting unrest. It treats Hong Kong with intimidation and threats.
Still, Beijing is unlikely to heed the voices in Hong Kong and the rest of the world.
Many Western nations have condemned the intransigent response of the Hong Kong government and its Beijing backers, but the US bill is the most significant worldwide challenge to Beijing.
Chinese Vice Minister of Foreign Affairs Le Yucheng (樂玉成) told US Ambassador to China Terry Branstad that the move constituted "serious interference in China's internal affairs and a serious violation of worldwide law", a Chinese Ministry of Foreign Affairs statement said.
Beijing was quick to admonish President Trump and Congress for passing two bills aimed at supporting human rights in Hong Kong.
The law prescribes economic sanctions on Asia's top financial hub, and diplomatic action on Hong Kong and Chinese officials found guilty of human rights abuses.
The sprawling red-brick campus became a battleground on November 17 between police and protesters armed with bows and arrows as well as Molotov cocktails.
Demosisto Secretary-General Joshua Wong said he thanked overseas Hong Kong people for their effort to lobby the US Congress, as well as frontline protesters.
Student union leaders also took to the stage and said that the Chinese Communist Party is "the most brutal colonizer of the 21st century".
"Later on we will hand over the campus to the university", he said. Some 1,100 protesters have left or have been arrested.
"China strongly urges the USA to correct its mistake and make a fresh start, not to put the Act into effect, and immediately stop meddling in Hong Kong affairs or interfering in China's internal affairs so as to avoid causing further damage to bilateral ties and cooperation in important areas between China and the United States", Le told Branstad.
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