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Committee Chairman Jerrold Nadler told ABC's "This Week" the panel wanted to get documents from the Department of Justice, the president's son Donald Trump Jr. and Trump Organization chief financial officer Allen Weisselberg, among others.

Co-hosted by the China Council for the Promotion of International Trade (CCPIT) and China Chamber of International Commerce, the forum has attracted business professionals from different countries.

Companies had shown enthusiasm for the business expo, Sun said, adding that it has reached its goal of 360,000 square meters of exhibition area, up 20 percent from last year. The average exhibition area to be occupied by Fortune 500 companies participating in the expo was up 14 percent, he said.

Co-hosted by CGTN and its content provider CCTV+ and CGTNC, the summit welcomes 300 guests from various media organizations, tech enterprises and think tanks from around the world.

Compared with a user pool as large as its e-commerce rival JD and half as big as Alibaba, Pinduoduo's GMV and revenue are only 4.1 percent and 1.5 percent, respectively, of Alibaba, Caixin said.