Iraq's main political coalition still can't decide who to present as the next prime minister, delaying a scheduled discussion in parliament, AP reported.
With much of the north and west of the country under the control of Sunni militants, there is an urgent need to form a new government in light of April's parliamentary elections.
The discussion over the new prime minister is now set for Thursday, said Kurdish lawmaker Perwan Muslih.
Prime Minister Nouri al-Maliki's State of Law party won the most seats in elections and he has vowed to stay despite pressure to step aside.
The State of Law is part of the National Alliance coalition of other Shiite parties, however, many of which oppose al-Maliki.
Critics of al-Maliki accuse him of monopolizing power and alienating Sunni and Kurdish minorities.