HONG KONG — The Chinese government on Monday voiced strong support for Hong Kong’s embattled chief executive, Carrie Lam, a day after yet another vast street protest against her government rattled the leadership in Beijing and the local political establishment.

The Foreign Ministry issued a forceful endorsement of Mrs. Lam on Monday. Beijing’s representatives in Hong Kong called in dozens of local politicians and business leaders to urge them to support her. And the Chinese state media began praising Mrs. Lam even as government censors assiduously tried to block word of the Hong Kong protests from reaching the public in mainland China.

But after three huge demonstrations over eight days, and her retreat on a proposal that would have allowed Hong Kong residents to be prosecuted in China’s opaque judicial system, it was unclear how long she would continue to govern.

The latest protest, on Sunday, was the largest yet, with a crowd that organizers estimated at almost two million in a city of seven million people. While Mrs. Lam had indefinitely suspended her push for the Beijing-backed extradition bill the day before, protesters still filled the streets, calling for her to withdraw the legislation instead of suspending it, and demanding that she resign.