If it's Tuesday, America is in mourning again after another school campus is now a crime scene

as a mass shooting kills three students and injures five at Michigan State University.

Plus, President Biden faces pressure to speak out as lawmakers call for the administration to disclose

more information about those mysterious objects in

U.S. airspace.

And it's official. Former U.N. Ambassador Nikki Haley announces she's running for president,

setting the stage for what could soon be a crowded and contentious fight for the future of the Republican Party.

Music of the Republican Party.

Welcome to me, the press now.

I'm Kristen Welker.

We begin with breaking news out of East Lansing, Michigan,

where we're learning more about the victims of last night shooting at Michigan State University.

While investigators pieced together what led to the shooting and why the gunmen targeted the campus,

police have identified the three people killed. Junior, Ariel Anderson, junior Alexandria Werner,

and sophomore Brian Frazier, whose family released this picture of him earlier this afternoon. Five other students were also injured and remain in critical condition.

Police say the shooting unfolded at two locations, Berkey Hall, an academic building, and the

student union. Here's how students described what happened.

I heard people screaming their shooting.

Yes. And that's when I began. Eventually, there was shooting in the courtyard. So, like, the courtyard

of the building of Hubbard, which is like the courtyard connects to acres. And then they

sort of blockading the doors. And we just started rushing, blocking the doors. And then one of the

doors, people just started screaming and running. I. And then one of the doors, people just started

...