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This is The World in Brief from The Economist.

Our top stories.

Justin Trudeau said he would resign as Canada's Prime Minister

and announced a contest to replace him as leader of the Liberal Party.

Canada's Parliament will be prorogued until March 24th. Mr. Trudeau's government was

thrown into turmoil in December following the resignation of Christia Freeland, the finance minister.

With elections due in October, around three quarters of Canadians disapprove of the Prime Minister,

who has been in power for nine years.

Nippon Steel and U.S. Steel filed a joint lawsuit in an American court, challenging President

Joe Biden's decision on Friday to block their proposed merger. Mr. Biden said the acquisition

could pose a threat to national security. The firms accused Mr. Biden of unlawful political influence. They also filed a separate suit against Cleveland Cliffs, a rival steel company.

America's Congress met to certify Donald Trump's presidential election victory.

The high-security session, which took place exactly four years after thousands of Mr. Trump's supporters

stormed the Capitol, was presided over by Kamala Harris, the vice president.

Republicans will now turn their attention to passing a bill advancing Mr. Trump's legislative priorities,

...