<p>Once again, Prime Minister Mark Carney has convinced a Conservative to cross the floor and join his Liberal Party — the third MP to do so in just a few months. And it comes as Conservative Leader Pierre Poilievre tries to manage the fallout from a caucus member’s trip to Washington. The National Post's Stuart Thomson and the Globe and Mail's Shannon Proudfoot take a look at Poilievre’s mounting challenges and how close the Liberals may be to a majority.</p><p><br></p><p>Plus, the U.S Supreme Court ruled this week that Donald Trump exceeded his authority by imposing sweeping emergency tariffs on trading partners, but the president says he won't back down. Brian Clow, former deputy chief of staff to Prime Minister Justin Trudeau, joins Catherine Cullen to discuss whether the ruling will help — or hurt — Canada.</p><p><br></p><p>Next, the government announced its long-awaited defence industrial strategy this week, with ambitious goals to boost exports, create 125,000 jobs and award...