>> dana: bombshell development in the russia investigation. former trump attorney michael cohen making a surprise appearance in federal court, entering a new plea deal with robert mueller, admitting he lied to congress. rick levinthal outside the courthouse. but first mike emanuel with reaction on capitol hill. mike? >> reporter: good afternoon. some democrats say this is a sign that robert mueller's investigation is heating up. >> yeah, it certainly does because of cohen's relationship with the president. but exactly what the lies were, i guess that will come out when the plea is made. but it definitely feels like there's an accelerated pace. >> reporter: a key intelligence committee republican said this proves the value of the work being done by robert mueller and his team. >> that's obviously of great concern to me. i'm very glad that the special counsel is pursuing those who