Submitting bids to the International Olympic Committee by the deadline were Rome ; Madrid; Tokyo ; Istanbul; Doha, Qatar (also known as ) File:Flag of Qatar.svg; and Baku, Azerbaijan (also known as ) File:Flag of Azerbaijan.svg. The U.S. Olympic Committee announced last week it would not submit a bid, assuring at least a 20-year gap between Olympics on American soil for the fourth time. All six cities had previously announced their candidacies. All six contenders have made previous bids, and two -- Rome and Tokyo -- have hosted the Olympics.