headquarters in new york city. breaking overnight, new details about the nation s latest mass shooting. this time at the university of nevada las vegas. what we re learning about the suspect s possible motives. new this morning, fireworks at the fourth republican presidential debate as the gop front-runner who was not there is back in a new york city courtroom today. on capitol hill, what s next for u.s. aid to ukraine and israel after senate republicans block a bill on president biden s national security package. meanwhile, today marks two months since hamas terror attack against israel. now israel says its forces have encircled the southern gaza home of a top hamas leader, thought to be hiding under ground. and we begin this morning with another mass shooting in america. this time on a college campus at the university of nevada las vegas. three people are dead, a fourth person has been hospitalized, all just a little over a week before the semester was set to end.