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This is today explained. I'm Sean Ramosferum.

You might have heard we're heading for a trade war.

Wall Street is worried about a trade war.

President Trump says he will slap tariffs on steel and aluminum, which seems bad.

This is leftist economic policy, and we've tried it a whole bunch of times of the last two centuries,

and every time American families have suffered.

I love the president. I think he's done a terrific job up to now.

This could turn everything the other way.

But also, maybe good?

The president's hasty announcement of a trade war appears to have been spooking markets.

He wrote, when a country USA is losing many billions of dollars on trade,

with virtually every country it does business with, trade wars are good and easy to win.

There are a lot of moving parts of this thing.

Aluminums involved, NAFTAs affected, Brazil's going to be mad.

If the United States is about to piss off a bunch of its friends, you should know exactly why.

So I asked Matthew Eglaceus what's up. He writes about economic policy at Vox.

I really thought I understood how decision-making worked in the Trump White House,

...