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>> i say that because nbcs image has been tarnished by its anchor making exaggerations and fabrications about his exploits. how can you believe a network whose major anchor of the flagship broadcast you cant trust what hes saying? >> what do you make of these stories that have come out? i say this because i know you know something of network intrigue and how network execs think or dont think or whatever you want to think of these leaks that have been coming in the press that well he shouldnt be ...

>> succeeding managing editor of "world news," david muir. >> good evening. >> reporter: muir who currently anchors world news weekend and "20/20" will start in his new role september 2nd. >> i think of the 12-year-old boy who grew up in upstate new york, had dreams of being a reporter and one day i would see the world. as the that boy with a huge imagination, i could never have imagined seeing the world with diane sawyer. >> reporter: while leading the flagship broadcast, hell anchor "20/20" wi...

>> succeeding managing editor of "world news," david muir. >> good evening. great to have you with us -- >> reporter: muir who currently anchors "world news weekend" and "20/20" will start in his new role september 2nd. >> i think of the 12-year-old boy who grew up in upstate new york, had dreams of being a reporter and one day i would see the world. as the that boy with a huge imagination, i could never have imagined seeing the world with diane sawyer. >> reporter: while leading the flagship br...