Happening now, the US expresses outrage over the Israeli airstrikes that killed seven aid workers in Gaza.

Prime Minister Benjamin Netanyahu is calling the attack unintentional and

vowing an investigation. We'll get reaction from an A group director who was a friend

of one of the victims. Also tonight Donald Trump is following up a stop in Michigan with

another battleground state visit in holding a rally in Wisconsin this hour. He's

using his return to the campaign trail to ramp up his rhetoric on the border crisis and to double down on calling undocumented immigrants animals.

Plus, breaking news as parts of the US are already reeling from destructive

storms millions of Americans are at risk tonight for very severe weather

including the most significant threat of tornadoes so far this year.

Welcome to our viewers here in the United States and around the world.

I'm Wolf Blitzer, you're in the situation room. We begin with a deadly strike on aid workers in Gaza.

It's prompting new condemnation of Israel's war

tactics and forcing the suspension of desperately needed food deliveries to

Gaza.

CNN's Jeremy Diamond has more from Jerusalem. We want to warn you some of the images in this

report are graphic and may be disturbing to viewers.

There is no mistaking the target of this Israeli strike. The World Central Kitchen's logo still visible after a missile tore through the roof of this vehicle.

Pieces of the aid organization's emblem

scattered throughout the charred hull of a second vehicle.

And then there are the bodies of the aid workers themselves.

Patches proudly worn on chests over bulletproof vests that offer no more protection in Gaza

than the emblem of a humanitarian aid organization.

...