Wong and two other activists were taken into custody after the hearing. Wong was not a leading figure in last year’s anti-China protests but has drawn the wrath of Beijing, which sees his activism as a “black hand” of foreign forces.
Demosisto members Nathan Law and Agnes Chow also said they were stepping down from the group.
The legislation pushes Beijing further along a collision course with the United States, Britain and other Western governments, which have said it erodes the high degree of autonomy the global financial hub was granted at its July 1, 1997 handover.
The China Daily said Trump's pledge to "take action to revoke Hong Kong's preferential treatment as a separate customs and travel territory", and to impose sanctions on individuals, would hurt the US, and unite Hong Kong with mainland China.
Wong became the poster child of the huge pro-democracy "Umbrella Movement" protests of 2014. Wong and his party, Demosisto, have denied supporting independence for the city.
Au Nok-hin and Jeremy Tam were arrested on suspicion of obstructing police, Tam's Civic Party said on its verified Facebook page.
Amid fears of Chinese intervention in Hong Kong politics, several young pro-democracy leaders including 23-year old Demosisto party leader Nathan Law have been elected to the 70-seat Hong Kong Legislative Council.
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