'This Week' Transcript 9-12-21: Dr. Vivek Murthy, Sen. Joe Manchin & Sen. Bernie Sanders

Dr. Vivek Murthy, Sen. Joe Manchin & Sen. Bernie Sanders were on "This Week" Sunday, September 12. This is a rush transcript and may be updated.

A rush transcript of "This Week with George Stephanopoulos" airing on Sunday, September 12, 2021 on ABC News is below. This copy may not be in its final form, may be updated and may contain minor transcription errors. For previous show transcripts, visit the "This Week" transcript archive. STEPHANOPOULOS: Good morning and welcome to This Week. A week where we remember the toll of those attacks that transformed our country 20 years ago. President Biden led the commemoration yesterday with ceremonies at Ground Zero, Shanksville -- (BEGIN VIDEO CLIP) UNIDENTIFIED FEMALE: We are gathered today on hallowed ground.