From Muppet Wiki

Robert MacNeil is a newscaster and former co-host of the PBS series The Robert MacNeil Report which later became The MacNeil-Lehrer Report and then The MacNeil-Lehrer News Hour. He appeared as himself, interviewing Cookie Monster about "Cookiegate", in Sesame Street, Special, and also had a cameo in the celebrity version of "Monster in the Mirror". In October 1995, Robert MacNeil retired.

MacNeil later appeared on Sesame Street Episode 3740 as a special correspondent to Kermit the Frog. He covered the first WASA landing on the moon for Sesame Street News, much to Kermit's chagrin.