It was unclear what prompted the about-turn after lawmakers initially said they would postpone a crucial parliament session for a month, but the delay was met with widespread criticism both from their constituents and internationally.
The month-old crisis has seen a jihadist-led alliance overrun large swathes of northern and north-central Iraq, displacing hundreds of thousands of people and piling pressure on Nuri al-Maliki as he seeks a third term as prime minister.
They later backed down, with the interim speaker scheduling their next meeting for Sunday, but the initial decision nevertheless angered ordinary Iraqis.
"The postponement of the parliamentary session was a shock to Iraqis living amid a sea of blood and a lack of services and jobs," said Essam al-Bayati, a professor at the University of Kirkuk in northern Iraq.
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Though the constitution calls for the parliament speaker, president and prime minister to be chosen in a sequence over a maximum of 45 days, in practice political leaders normally agree the posts in a package.
In a de facto agreement that has emerged following previous elections, the speaker is a Sunni Arab, the premier a Shiite Arab and the president a Kurd.
Iraqi forces have largely regrouped after the debacle that saw soldiers abandon their positions and, in some cases, even their weapons and uniforms as jihadist-led militants conquered the second city of Mosul and advanced to within 80 kilometres of Baghdad.
But while Iraq has received support, including equipment, intelligence and advisers from the United States, Russia, Iran and even Shiite militias it once shunned, efforts to battle the militant offensive were dealt a blow when a senior general was killed yesterday.