Happening now, breaking news across the board in Buffalo.

President Biden visits a community in mourning and says the racist ideology that led to mass

murder there cannot be tolerated anywhere.

White supremacy is a poison. It's a poison running through it really is.

Running through our body politic and it's been allowed to fester and grow right in front of our eyes.

No more. I mean no more.

More on the president's visit coming up, including new word that the alleged gunman was not put on a red flag list after making a prior threat.

We're also joined by Buffalo's mayor who's standing by Live. He says he won't let

what happened be forgotten. Also tonight, key primaries in five states including

here in Pennsylvania and especially here a key

test that the former president's influence. We'll have the very latest that a

close look ahead to see an un-prim primary night coverage just under an hour or so from now and later.

Even as Ukrainian fighters give up their 82 day defense of Marriupol, a retired Russian military expert on Russian TV, says his country is now isolated

in the world and in real trouble in Ukraine.

We want to welcome our viewers here in the United States and

around the world. I'm Wolf Blitzer in Philadelphia, that's Independence Hall

behind me and you're in the situation room. We begin with the very latest we're learning right now about the alleged

gunman now in custody charged with first-degree murder in the racist mass

shooting at the top's friendly supermarket on Saturday.

He was not, as you know, from Buffalo,

but more than three hours away from Buffalo,

where details of a very troubled past

...