Wong, 22, became the face of the 2014 pro-democracy protests which called for the city to pick its own leaders.
People in Hong Kong are again out on the streets, this time against a controversial bill which would allow extradition to mainland China.
China has said it will continue to support Ms Lam.
Organisers say more than two million people rallied against the extradition bill on Sunday, despite it being suspended. Police put the figure at 338,000.
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