i'm elizabeth vargas. it's friday, november 19th. breaking news this morning. an explosion rips through new zealand's largest coal mine, trapping as many as 27 miners underground. we have the latest overnight. >>> enough is enough. as the busiest travel week of the year begins, these pictures of security patdowns have people screaming. this woman wants a criminal investigation. >> i feel like i was sexually assaulted. >> the head of the tsa responds here, live. >>> beverly hills murder mystery. new developments in the killing of a high-powered publicist to the stars. was it a random act? or revenge? >>> and popping the question in a log cabin. we show you the spot in kenya where william proposed to kate. the private moment in this royal romance, revealed. >>> good morning, america. robin roberts is off today. and i'm glad to be here. and can you believe that cabin? >> it was a little less luxurious than i expected. >> very rustic. and i must say, that's pretty cool that was the place he popped the question

elizabeth vargas joins us from new york with a preview of "20- 20."ell us about the two-tier girls that grew up in the same florida suburb. >> this is the kind of story that you watch and you shudder because of one moment, one bad decision has changed two lives forever. they will both dating the same young man. when you see him, our reporter calls him closer. you wonder why the two girls fell so hard for this young man. girls do these kind of things in their teenage years. it's got very heated between the two girls. one of the girls pulled caliphate knife into a fight and kill to the other. -- one girl pulled a knife. her family is grieving and the other girl's family is grieving because she's in prison for a long time. >> the reporter said that the young man does not have much going for himself. d-day did both girls at the same time. how is erecting? >> he stepped back from the story completely. as one girl was dying in a hospital, hwe did not going to see her. he did not go to the funeral in there. this is a cautionary tale for young girls. your pas

i'm elizabeth vargas. >> and i'm george stephanopoulos. it's thursday, november 18th. and this morning, 2012 showdown. sarah palin makes a bold prediction to barbara walters. >> if you ran for president, could you beat barack obama? >> i believe so. >> and she may have competition. the billionaire who says he'll spend big if he runs. >> would you take her on? >> i have no choice. i would take her on. >>> also, will will and kate soon set their date? new details on who will foot the bill. and what will promised kate's father. >>> a new justification for stepped-up security. abc news obtains evidence of what airport screeners missed. >>> and viewer revolt. what sparked a "dancing with the stars" viewer to shoot a hole in the television set? >> i guess he didn't like bristol palin's paso doble. >> i don't know. it's on fire on the internet. people calling into abc, with lots of commentary and complaints about the results. and accusations that it's all politically-motivated. >> a huge controversy. we're going to get into that ahead. >>> welcome, elizabeth vargas. robin rob