The reason Pompeo is in Iraq
Lawmakers on Capitol Hill suggested that they have seen evidence that Iranian-backed Shiite militias inside Iraq were plotting attacks against American troops stationed there. Secretary of State Mike Pompeo revealed that U.S. diplomatic personnel in the region had been alerted to potential threats but offered no details.
Sauce: https://m.washingtontimes.com/news/2019/may/6/uss-abraham-lincoln-carrier-deployed-over-iran-cre/