BANGLADESH, Jan. 15 -- In line with an Iranian plan launched at last year's UN General Assembly by president Hassan Rouhani that calls for a security architecture that would exclude external forces, Tehran is arguing that an expulsion of all US troops from the Middle East would constitute revenge for the killing by the US of Gen. Qassem Soleimani, commander of the Iranian Quds force.

While it likely would be a drawn-out process, Iraq's parliament took a first step in this direction by unanimously asking the government, in the absence of Kurdish and Sunni Muslim deputies, to expel US forces from the country.

Ultimately, Iran may get only part of what it wants, at best.

Iraqi PM Adel Abdul Mahdi has dialed back his initial support for parl...