In October 2020, a March remark by Dr. Anthony Fauci was used in a Trump campaign advertisement. Fauci immediately condemned its use, saying it was taken out of context, and noted that he had never publicly endorsed a candidate.
Trump defended the advertisement on Twitter:
Dr. Fauci subsequently supported pulling the advertisement altogether.
The New York Times – Fauci Calls Out Trump Campaign Ad That Used Him Without Permission
BBC News – US Election 2020: Anthony Fauci says Trump campaign ad quote misleading
Reuters – Fauci says his remarks were taken out of context in Trump ad