AILSA CHANG, HOST: Before walking out of a volatile interview on NBC's "Meet The Press" this weekend, President Trump defended his progress in the war with Iran. He said a ceasefire has proven effective and that the conflict is only three months old. Meanwhile, Iran and Israel traded strikes overnight, and one of the main stumbling blocks of the war, Iran's control of the Strait of Hormuz, remains unresolved. NPR's Kat Lonsdorf looks at the state of the strait.