Terrorist group ISIS will likely be the winner as tensions between Washington and Tehran mount after the U.S. killing of Iran’s most powerful military commander, experts say.

The American assassination of a top Iranian commander may make it impossible for American forces to stay in Iraq. That could ease an ISIS comeback.

The United States plans to designate an Iranian-backed Iraqi militia as a foreign terrorist organization, the State Department said on Friday, accusing the Asaib Ahl al-Haq group of being a violent proxy of Tehran.