When Donald Trump imposed new trade tariffs against some of the U.S.' biggest allies, Justin Trudeau didn't take it lightly. Could this be the start of a major trade war? Plus, more on the federal Liberals' decision to buy the Trans Mountain pipeline project. Rosemary Barton hosts Andrew Coyne, Chantal Hébert and Althia Raj.

When the federal government announces it's buying the Trans Mountain pipeline project for $4.5 billion, there's really only one thing to do: convene a special edition of At Issue to break down what it means for Ottawa, Alberta, British Columbia and Canadian taxpayers. Rosemary Barton hosts Andrew Coyne, Chantal Hébert and Althia Raj.

Doug Ford’s in the middle of a membership scandal, Andrea Horwath tried to explain a billion dollar mistake in her costing plan, and Kathleen Wynne basically tried to stop the bleeding. We're talking Ontario election with the man behind CBC's poll tracker. And Aecon, the Canadian construction giant, was on track for a big buy-out by a Chinese company... The federal government says it's not happening. Rosemary Barton hosts Andrew Coyne, Chantal Hébert and Eric Grenier.

Bill Morneau is breaking out the taxpayer's wallet to help Kinder Morgan's Trans Mountain Expansion weather British Columbia's storm, is that going to be enough? And Justin Trudeau seems to be trying to put himself opposite Stephen Harper rather than Andrew Scheer- just when the former Prime Minister is creeping back into public life, too. What's the danger for Liberals and Conservatives here? Rosemary Barton hosts Chantal Hébert and Andrew Coyne.

Quebec's Roxham Road still sees a steady stream of asylum seekers- and it's predicted to get bigger when the warmer weather really gets here. This week, the Liberal government had three ministers out to send a message to critics and the country: this is under control. And Jagmeet Singh is dealing with a second sexual harassment complaint in the NDP- this time it's MP Christine Moore. How's he handling it, and does he have time to deal with anything else right now? Finally, Andrew Scheer is trying to make nice with Quebec- will it work? Rosemary Barton hosts Andrew Coyne, Chantal Hébert and Paul Wells.

Erin Weir has been turfed from the NDP caucus- Jagmeet Singh's reaction to a third-party investigation into harassment claims was fast and forceful.

The Liberals tabled a bill this week that could change the way elections are held, but no, it's still not touching first past the post. And the Bloc Quebecois is all but falling apart- seven former MPs who left caucus in February are now starting their own party, risking splitting the separatist vote in Quebec. Rosemary Barton hosts Althia Raj, Chantal Hébert and Andrew Coyne.

It's provinces versus the feds this week- both Saskatchewan and BC are going to court to push back against Justin Trudeau's Liberals. Scott Moe is anti-carbon tax, John Horgan is anti-pipeline. Where does that leave federal provincial relations? And Kathleen Wynne has a five billion dollar disagreement with Ontario's Auditor General. Rosemary Barton hosts Chantal Hébert, Andrew Coyne and Shachi Kurl.

The pipeline spat is still going- and all sides are digging in. Sources are now saying that the federal government has a Plan B if Kinder Morgan drops out- they'll be courting other companies to invest. Chris Hall is live from the Liberal National Convention, where the leading party is trying to set its agenda for the next election- are they succeeding? And Kathleen Wynne accuses Doug Ford of being Donald Trump. Does that make her Hillary Clinton? Rosemary Barton hosts Chantal Hébert, Andrew Coyne and Chris Hall.

Pipelines politics are heating up- Justin Trudeau is heading back from Peru, where he was attending the Summit of the Americas, early. He plans to get Rachel Notley and John Horgan in a room together to work things out- but it's obvious which side he's on. And Maxime Bernier lost the Conservative leadership election, but he hasn't fallen off the map- a chapter from his forthcoming book is causing controversy. Rosemary Barton hosts Chantal Hébert, Andrew Coyne and Althia Raj.

NAFTA negotiations may be nearing the end- what's in a symbolic agreement? And the Conservatives used the last week of Question Period before the break to hammer the Liberals, asking for a briefing from the public servant involved in the Atwal Affair. Daniel Jean will brief Andrew Scheer (classified) and MPs (unclassified). We ask At Issue who exactly is playing politics here. And carbon pricing as a concept has taken a beating in the public forum- and the Liberals may lose a few key premiers on this issue with more than one provincial election coming up. Rosemary Barton hosts Andrew Coyne, Althia Raj and Jason Markusoff.