KEY POINTS
  • The Pennsylvania Republican says, "I'm beside myself," because he said he was supposed to be there.
  • Among the wounded was House Majority Whip Steve Scalise who's in stable condition.

Rep. Ryan Costello said on CNBC, "I'm beside myself," because he said he was supposed to be at a congressional baseball practice where a gunman opened fire on Wednesday morning.

Costello said on "Squawk Box," shortly after the shooting, he would have been "in the line of fire" because he plays shortstop.