savannah believed she left her house about 10 minutes till 10:00.road in three and a half to five minutes-- plenty of time. james farren: --she has time to kill robin, and then drive back to manhattan street and arrive about 10:20. josh mankiewicz (voiceover): that 10 minute gap cast doubt on katie's alibi. josh mankiewicz: so it's really katie's best friend that's sort of putting the noose around her neck. absolutely. josh mankiewicz (voiceover): something else was hurting katie, too. if you watch "dateline" regularly, you know cell phone data can either make or break a case, and that was certainly true in this one. james farren: at 10:13, katie pinged off an antenna at the lockney tower. josh mankiewicz (voiceover): which was close to savannah's house and also to the crime scene. and when she checked her voicemail, it pinged off that tower. so that ping from katie's phone, that's actually consistent with your theory-- james farren: it fit our theory. --that she had committed the murder and was heading home. it fit our theory. that's right. josh ma

and then they spent the rest of the evening at savannah's house.d the only time she left the house was a trip with the kids to mcdonald's. josh mankiewicz: and you were gone how long? maybe 20 minutes. the kids were with you the entire time? the kids were with me. josh mankiewicz (voiceover): after mcdonald's, she said, they returned to the house. josh mankiewicz: and you were at savannah's until? till approximately 10:00 to 10:15 that night. i mean-- and then you went home. and i went home. my clock said 10:18 when i pulled into the driveway. and during that time, you were always in someone else's company. right, yes, i was. there were three adults and two kids. you were never alone? i was never alone. would you ever leave your son? no, my son stays with me. josh mankiewicz (voiceover): katie insisted she did not kill robin, and she stuck to that story, even in the face of new evidence that investigators believed would prove katie was lying. coming up. he said these phone records was the last thing that i needed. josh mankiewicz (voiceover): was i

and we're talking about like the court reporter in savannah, georgia, or like my dad, he tested the watermy corps of engineers for years in omaha, nebraska. and i'm struck by the fact that angela is saying, all these folks are calling in, asking these hosts to please help them, please get to talk to them. republicans and the republican members of congress. they seem to know that this is an issue because we have reporting that notes privately from politico. gop senators privately pushed musk to coordinate more with congress. members of the senate caucus. returning from a white house meeting with elon musk on thursday afternoon pushed for the billionaire to coordinate more with congress on his cuts to the federal government. why are they asking elon musk? aren't they the members of congress? doesn't congress have the power of the purse? aren't they the elected people? i don't understand the deference. >> yeah, it. >> is bizarre. >> and i can tell you from inside. >> the republican caucus, it was always a great. >> frustration to me. >> and i would try to explain to my fellow republicans tha