Dr. Anthony Fauci has warned Americans to be cautious about holiday gatherings - but he's giving the green light for trick-or-treating this Halloween. On Sunday, Fauci told CNN's State of the Union that trick-or-treating outside can be done safely - especially if coronavirus cases and deaths continue their downward trend. Fauci said "this is a time that children love. It's a very important part of the year for children. I know my children enjoy it." Last week, Fauci said it's "too soon to tell" if it's safe for families to gather for Christmas this year.