General Martin Dempsey, the top U.S. military officer who visited Baghdad this week, told a Senate hearing on Wednesday that there was no doubt the Islamic State of Iraq and Syria (ISIS) would be pushed out of Tikrit, but that “the question is what comes after.”

Voicing concern about treatment of Sunni Muslims by the overwhelmingly Iran-backed Shi’ite attacking force, Dempsey said: “The question is what comes after, in terms of their willingness to let Sunni families move back into their neighborhoods, whether they work to restore the basic services that are going to be necessary, or whether it results in atrocities and retribution.

He said while Iran is playing a helpful role against ISIS militants in Iraq now, once the extremists are vanquished, Tehran-backed militias could undermine efforts to unify the country. […]