The postponement comes a week after the Parliament failed to muster a quorum at its first session, further delaying government formation.
As Islamic State of Iraq and Syria continues to threaten Iraq's stability, Iraqi leaders -- along with U.S. President Barack Obama and Secretary of State John Kerry -- have championed a two-track approach in response to the crisis, militarily and politically: fight ISIS and form an inclusive new government in line with Iraq's constitutional mandates.
According to Iraq's constitution, Parliament must select a prime minister within 75 days of its first session.
Prime Minister Nouri al-Maliki, whose bloc won the most votes in April, wants to form a government coalition. Opponents, however, have criticized his response to the security crisis and fault his policies for being sectarian and authoritarian.
Senior Shia cleric Ayatollah Ali al-Sistani has encouraged Kurdish, Shia, and Sunni parliamentarians to agree on candidate appointments before convening the first full session.