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developments and changes overnight on capitol hill. this afternoon, the committee investigating the january 6 insurrection will call a special witness in this surprise public hearing. that is former white house chief of staff mark meadows' aide, former aide, cassidy hutchinson. she's expected to testify starting at 1:00 eastern today. last week in videotaped testimony, she revealed the names of several republican lawmakers who sought blanket pardons. so, let's begin with that, with our own correspondent jessica schneider. jess, there wasn't going to be a hearing this week at all. the...

Truck. and killed two people on the train. 50 more were injured. eight of the train's ten cars derailed and fell on to their side. forced many of the 287 people onboard to climb out of windows. let's bring in mary skievo. what information will investigators be able to glean from that about this and what will they not be able to get from that? >> well, the black box on the train very much like black boxes on planes. recording parameters. the speed of the train when the horns, bells or signals were sounded. when the engineer applied the brakes, giving a good indication of when he had sighted the...