It was one of the harshest assessments ever from the mild-mannered longtime ally on Americas northern border.

Donald,in the over eight years, you and I have worked together, weve done big things.

We signed a historic deal that has created record jobs and growth in both of our countries.

Canadian PM Justin Trudeau holds a news conference on U.S. tariffs in Ottawa on Tuesday

Canadian PM Justin Trudeau holds a news conference on U.S. tariffs in Ottawa on TuesdayAdrian Wyld /The Canadian Press via AP/Getty

An op-ed today is titled Trump Takes the Dumbest Tariff Plunge.

Mr. Trump is whacking friends, not adversaries, it wrote.

Today, the United States launched a trade war against Canada.

Donald Trump and ABC News' Terry Moran

Make that make sense, Trudeau said.

Tariffs will go on external product on April 2nd.

Oh, that seems fair to me, doesnt it?

Another goal of Trumps tariffs is to encourage businesses to move production back to the U.S.

The president himself has acknowledged that tariffs could create a little pain short term for Americans.

We will use every tool at our disposal so Canadian workers and businesses can weather this storm.

Addressing the American people directly, he said, We dont want this.

As of this morning, markets are down and inflation is set to rise dramatically all across your country.

U.S. stock markets plunged today, erasing gains since Donald Trump took office, according to CNBC.

We engaged closely and constructively with the President and his administration.

We did everything we promised.

We stuck to our word.

And we did it because we believe in working together to protect our citizens.

He made a surprise appearance in the shows Cold Open as a chainsaw-wielding Elon Musk.