The White House says Obama is nominating Matthew Tueller for the post in Yemen's capital of Sanaa.
A veteran diplomat, Tueller has been the U.S. ambassador to Kuwait since 2011. He's also held high-ranking positions in U.S. embassies in Egypt, Iraq, Qatar and Saudi Arabia. He worked previously in Yemen in 2000 and 2001.
Tueller has already been confirmed by the Senate once before, in 2011, for the Kuwait post.