Live in Times Square, this is Good Morning America.

We do have a lot to get to this morning.

Of course, those teams decided overnight for the NCAA Women's National Championship, Yukon, to face South Carolina.

They will face off tomorrow in Tampa. We'll have the highlights just ahead.

And overnight, we're also following that unrelenting outbreak of severe weather in the South, that once in a generation storm unleashing powerful

tornadoes and just drenching rain. Team coverage is ahead, and we've got the measles cases as well.

They're continuing to rise across the country. Over 600 now nationwide, up an additional 124

confirmed cases from last week's CDC update.

And now word of an outbreak at a daycare center.

That's a troubling development, so we'll have that.

But first, the news that we've all heard so much about.

President Trump's sweeping tariffs taking effect, businesses and consumers bracing for the impact with that massive plunge on Wall Street.

ABC's Jay O'Brien leads us off with the very latest from Washington.

Good morning, Jay.

Jena, good morning.

President Trump doubling down on these tariffs overnight, arguing they will grow U.S. manufacturing

and supercharge the economy, even as stocks plunge and fears of higher prices set in.

Overnight, the start of President Trump's 10% tariffs on most goods entering the U.S.

Coming after stocks plunging Friday, the SMP 500 losing $5 trillion in just two days.

The worst on Wall Street since the pandemic.

Secretary of State Marco Rubio describing the tanking global markets this way.

I don't think it's fair to say economies are crashing. Markets are crashing because markets

...