President Joe Biden on Thursday declared a halt to U.S. support for a Saudi Arabia-led military campaign in Yemen, demanding that the more than six-year war, widely seen as a proxy conflict between Saudi Arabia and Iran, “has to end.”

Biden also named veteran US diplomat Timothy Lenderking as the US special envoy for Yemen in a bid to step up American diplomacy “to end the war in Yemen, a war which has created humanitarian and strategic catastrophe”...