collapses. and live pop. look at what s happening in the background of this reporter s live shot. a young man, on bended knee, not expecting to be popping the question on live television. so, what does she say? this is a big news morning, including what is really an earthquake, for american business and politics. our nation s credit rating has been downgraded. we allllnow what it means to have a bad credit score in our personal lives. that s basically what s happened to our government this morning. it has consequences for the rest of us. we ll have that news this morning. we begin with breaking news out of afghanistan. the taliban is taking responsibility for shooting down a u.s. helicopter. more than 30 people were killed. and there are reports this morning, that most of them are u.s. navy s.e.a.l.s. abc s martha raddatz is in washington. and, martha, what do we know right now about this incident? reporter: this is just devastating news, bianna. it was a u.s. aircraf