He said the protesters were fabricating facts to keep crowds motivated by claiming many of their friends were killed by the police.
He voted at the Carvel State Office Building in his home town of Wilmington, Delaware.
He told the media that the personal contact that was important for diplomacy to be effective would be absent this year.
He said the new national security law will target the four "most urgent and harmful" criminal behaviors: secession, subversion of State power, terrorist activities and collusion with foreign or external forces to endanger national security.
He said the teams on both sides should work closely to make the visit "successful and special."
He said the ministry is currently working with other government branches such as the General Administration of Customs and the Ministry of Finance to discuss details of tax incentives, as well as favorable policies for the research and development of pharmaceutical business in bonded areas, and the new optimization policies will be soon introduced.
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He stressed that upholding the "one country, two systems" principle and advancing the reunification of China is a basic policy in upholding and developing socialism with Chinese characteristics in the new era.
He stressed strengthening the regulation role of macroeconomic policies, calling for more positivity in the country's proactive fiscal policy and the rollout of more targeted interim policies in cutting taxes and fees to help micro, small and medium-sized firms tide over difficulties.
He said that the radical criminal acts taking place in Hong Kong have grossly trampled the rule of law and social order, seriously harmed the prosperity and stability of the special administrative region and severely challenged the bottom-line of the "one country, two systems" principle.
He stands ready to work with Conde in seizing the historic opportunities offered by the joint construction of the Belt and Road as well as the prosperous development of China-Africa cooperation, he added.