debate about tamerlan tsarnaev shot dead during the manhunt. they interviewed him at the request of russia and dropped the matter after asking for more specific information from russia the fbi never received. >> why is this fbi interview important? because if he was on the radar and they let him go, he was on the russian's radar, why wasn't a flag put on him. >> reporter: michael mccall says he and fellow republican, peter king, want answers from the fbi. democrats have questions too. >> why wasn't he interviewed when he came back, either at the airport when he was returning, or later? what happened in chechnya? >> a lot of questions. emily, do lawmakers feel like the fbi dropped the ball by not interviewing the older brother after his trip to russia? it certainly sounds like it. >> that phrase, dropped the ball, is exactly what we heard lindsey graham talk about on one of the talk shows today.