Hello and welcome to NewsHour on the BBC World Service. I'm Celia Hatton, and I'm coming to you live from London.

First, a sound that's pretty unusual in Canada.

Boowing over the. national anthem, not just at this hockey game in a Canadian arena,

but at other games and matches too over the weekend. Canadian sports fans have made it pretty

clear what they think of tariffs President Trump has slapped on Canada.

For his part, President Trump has warned Americans there could be pain following his imposition

of tariffs on Washington's three biggest trading partners. But he said the taxes he's

introducing on Canada, Mexico and China will be worth it in time. They're due to come

into force on Tuesday. Speaking to reporters yesterday, Mr. Trump said he would be talking to the leaders

of Mexico and Canada today. I'm speaking with Prime Minister Trudeau tomorrow morning,

and I'm also speaking with Mexico tomorrow morning, and I don't expect anything

very dramatic. We put tariffs on. They owe us a lot of money, and I'm sure they're going to pay.

President Trump also had a message for the countries of the European Union.

You know, we have over a $300 billion deficit.

They don't take our cars. They don't take our farm products. They take almost nothing.

And we take everything from them. Millions of cars, tremendous amounts of food and farm products.

So the UK is way out of line. And we'll see the UK, but European Union is really

out of line. UK is out of line, but I'm sure that one, I think that one can be worked out,

but the European Union is an atrocity. We're going to hear from a supporter and also a critic of these tariffs.

But first, a bit of background on what's happening.

Stephanie Flanders is the head of economics and politics at Bloomberg.

At the most basic level, I mean, it is just another tax.

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