World powers and Iraq's top Shiite cleric Grand Ayatollah Ali al-Sistani have piled pressure on MPs to put aside their differences, with the country facing a major jihadist-led onslaught that has overrun chunks of five provinces.
But acting parliament speaker Mahdi Hafez announced at today's session that "no type of agreement was reached... between the various blocs", and the session was adjourned to Tuesday.
The latest stalemate came despite the announcement late yesterday of an agreement among Sunni Arab lawmakers on a candidate for speaker, a post traditionally held by the minority group that must be filled before the government formation process can progress.
Former parliament speaker Osama al-Nujaifi called today for a vote on Juburi, but Hafez rejected this, saying not all blocs were in agreement, despite there being more than enough MPs present to hold a vote.
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The UN's Iraq envoy Nickolay Mladenov had warned that "failing to move forward on electing a new speaker, a new president and a new government risks plunging the country into chaos".
"It will only serve the interests of those who seek to divide the people of Iraq and destroy their chances for peace and prosperity."
As the highly paid parliamentarians continue to squabble, militants launched a renewed push, seizing two towns northeast of Baghdad, while major attacks west of the capital were stymied by security forces and allied tribesmen.