Police fire tear gas on protesters in Hong Kong on Sunday. Photo: Isaac Lawrence/AFP via Getty Images

Hong Kong police used tear gas on thousands of protesters marching through the city on Sunday against China's plans to implement a national security law, per The Guardian.

Of note: This is the biggest mass gathering since Beijing's encroachment on Hong Kong's independent legal system sparked huge protests last year. Reuters reported earlier that police warned protesters not to break the ban on gatherings of more than eight people, a restriction imposed to curb the spread of the coronavirus.

Details: Police arrested at least one leading activist over the gatherings ban. Police said they arrested Tam Tak-chi for holding "an unauthorized assembly," according to AP.

  • Protesters chanted for "an end to one party dictatorship" outside a Chinese government office, Reuters notes.

The big picture: China is bypassing Hong Kong's legislature and chief executive to introduce the law — which could severely constrain the autonomy the former British colony has retained since it was returned to China in 1997, per Axios' Bethany Allen-Ebrahimian and Dave Lawler. It's expected to be passed on May 28.

  • Beijing's encroachment on Hong Kong's independent legal system sparked huge protests last year. Rallies had resumed on a smaller scale as social-distancing measures were lifted before this latest protest.

Go deeper: The year of the protest meets the year of the lockdown

Editor's note: This article has been updated with new details throughout.

Go deeper

Updated Sep 18, 2020 - Health

World coronavirus updates

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Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

Though health workers represent less than 3% of the population in many countries, they account for around 14% of the coronavirus cases reported to the World Health Organization, WHO announced Thursday.

Why it matters: The WHO called on governments and health care leaders to address threats facing the health and safety of these workers, adding that the pandemic has highlighted how protecting them is needed to ensure a functioning health care system.

Biden: The next president should decide on Ginsburg’s replacement

Joe Biden. Photo: Drew Angerer / Getty Images

Joe Biden is calling for the winner of November's presidential election to select Ruth Bader Ginsburg's replacement on the Supreme Court.

What he's saying: "[L]et me be clear: The voters should pick the president and the president should pick the justice for the Senate to consider," Biden said. "This was the position the Republican Senate took in 2016 when there were almost 10 months to go before the election. That's the position the United States Senate must take today, and the election's only 46 days off.

Trump, McConnell to move fast to replace Ginsburg

Photo: Alex Wong/Getty Images

President Trump will move within days to nominate his third Supreme Court justice in just three-plus short years — and shape the court for literally decades to come, top Republican sources tell Axios.

Driving the news: Senate Majority Leader Mitch McConnell and Senate Republicans are ready to move to confirm Trump's nominee before Election Day, just 46 days away, setting up one of the most consequential periods of our lifetimes, the sources say.