Leading members of the coronavirus task force warned White House officials about the health risks of holding large-scale indoor campaign rallies and advised against the mass gatherings, according to two people familiar with the discussions.

Dr. Anthony Fauci, the nation’s top infectious disease expert, and task force response coordinator Dr. Deborah Birx both vocalized concerns internally in the last week about the safety of holding a rally with as many as 19,000 of people in an enclosed arena in Tulsa, Oklahoma on Saturday.