Prime Minister Justin Trudeau makes a surprise trip to Mar-a-Lago to meet with President- elect Donald Trump.

Major Canadian news organizations, including the CBC, are banding together to sue OpenAI over its use of copywritten material to train its ChatGPT software. The news organizations argue it's illegal.

And: A town in Saskatchewan is seeing a resurgence of scurvy. More than two dozen cases have been diagnosed, alarming doctors and leading some to point to the rising cost of food as the reason why people aren't getting enough vitamin C.

Also: As Wicked smashes records for movie musicals, theaters have to remind patrons to keep the singing to a minimum. But movie theatre singing is the least of the issues. Phone use, talking and audience members filming the screen for social media mean movie theatre etiquette has fallen off a cliff. Is the magic of movie-going changing, and how are theatres responding?

Plus: Hamas losing control of Gaza, Syrian rebels launch assault on Aleppo, women’s hockey — season two, the Canada Post strike hurting small business, and more.

In a world-first, the Australian government has passed a bill banning social media use for children under 16. A similar ban has not yet been proposed in Canada, but growing concern over the safety of social media for young people has some questioning whether similar action would be beneficial here.

And: MPs in a commons committee were angered this morning when they wanted to hear from the CEO of Rogers but he never came. The testimony was supposed to be in response to a CBC Go Public investigation over telecom price hikes.

Also: A blood test that screens for 50+ types of cancer is now available at a private clinic in Canada. But is the benefit worth the price tag?

Plus: nuclear waste site selected, massive strike on Ukrainian energy grid, drug approved to treat obesity and heart attack risk, and more.

Some of the premiers say they don’t think the prime minister is the right person to lead Canada against tariff threats from the incoming U.S. president. They’re meeting with their fellow premiers and Justin Trudeau. He says it’s time for a united front and a Team Canada approach.

And: The official opposition says the Liberal proposal for a GST holiday and rebate cheques for some Canadians is too costly. The N.D.P. says the tax break should start immediately, and the rebates should go to more people.

Also: A hiker has been found, after surviving for more than five weeks in the backcountry of northeast British Columbia. During that time, the snow fell and temperatures plunged below -20 C.

Plus: Bearspaw First Nation sues the federal government for $1 billion over $5 treaty payments, people return home as Lebanon ceasefire takes hold, and more.