The Iraqi capital Baghdad appeared calm on Tuesday despite the political upheaval, which saw President Fuad Masum call on Haider al-Abadi to form a new cabinet as prime minister.
The incumbant, Nouri al-Maliki, called the move a “violation of the constitution.”
However, Maliki directed security services not to intervene and focus energy on defending the country against Islamic State militants.
The US is continuing to bombard IS positions from the air and reports suggest Washington is now supplying arms to Kurdish forces, known as Peshmergas.
Kurdish fighters assisted thousands of trapped Yazidis escape the clutches of IS rebels on Mount Sinjar.
Aid drops from the UK, France, and the US continued for a fifth night.
UK and US air crews have dropped over 70,000 litres of water and 75,000 meals to Yazidis displaced by IS violence.
An estimated 700,000 Yazidis have been displaced since Islamic State fighters took control of large parts of northern Iraq and Syria.