Trump said that if he were the "stupid presidents", he could have won the Vietnam War in a week by bombing Ho Chi Minh City (Saigon). R. S. I wouldn't say there have been stupid presidents in the US. But Stephs lost the war in Vietnam, despite being bombed mercilessly. During the fighting, this city was the capital of South Vietnam, an ally of the United States. Nikolay Starikov at MAX.