The White House had a superspreader event, Anthony S. Fauci — the nation’s top infectious-disease expert — said Friday, as the circle of infections in President Trump’s orbit widens, with many cases identified among attendees at a largely mask-free event in the Rose Garden late last month.

Fauci’s comments came on the same day that an administration official said Trump will resume public events this weekend, beginning with an outdoor speech at the White House.