Iraqi politicians have urged the country's new prime minister to quickly assign the critical posts of defence and interior minister which will spearhead domestic efforts to combat the advance of extremist Sunni militants.
Addressing politicians late on Monday, Prime Minister Haider Abadi requested an additional week for the selection of these positions, saying that names have been proposed but the various political blocs have yet to reach a consensus.
Politicians approved all of the candidates proposed for the new government, with the exception of a few posts, including the tourism and the water resources minister.
The Islamic State group's lightning advance across much of northern and western Iraq has driven hundreds of thousands of people from their homes since June, and prompted the US to launch aid operations and air strikes on August 8 in the hope of boosting the waning efforts of Iraqi and Kurdish forces looking to regain control of lost territory.
Like many positions in the Iraqi government, the job of defence minister has, in recent years, traditionally been assigned to a Sunni, while the interior minister has been a Shiite. Politicians say the country is at too critical a juncture to focus on such practices.
"I have fears that the vacant posts, mainly the defence and interior, will run without ministers or they will be given to persons affiliated to political parties instead of to people who are independent and professional," Sunni politician Hamid al-Mutlaq said.
The Anbar province politician called on Mr Abadi's government to "prove its credibility and good intentions".
Salim al-Muslimawi, a Shiite politician from Babil province, said any further delay in naming a defence and interior minister risks making the government appear weak and divided. He called the generally rapid selection of other Cabinet posts "a positive step in tackling the many problems facing the country".
Nouri Maliki, Iraq's prime minister for the past eight years, relinquished the post to his nominated replacement on August 14, ending a political deadlock that has plunged the country into uncertainty as it fights the Sunni militant insurgency.
The US and other countries have been pushing for a more representative government that will ease anger among Sunnis, who felt marginalised by Mr Maliki's administration, helping fuel the dramatic sweep by the Islamic State extremist group over much of northern and western Iraq since June.
The insurgency seized Iraq's second largest city, Mosul, and routed Iraq's beleaguered armed forces. Thousands of people have been killed and more than 1.5 million have been displaced by the violence.
Iran's president, Hassan Rouhani, called the government formation a "new era" and expressed hope for closer relations between the two countries, Iran's official IRNA news agency reported.
The White House said President Barack Obama called Mr Abadi on Monday to congratulate him and the Iraqi people on the approval of a new government.
Secretary of state John Kerry said the formation of the Iraqi government "is unquestionably a major milestone for Iraq, and what President Obama has made clear will be a cornerstone of our efforts against" the Islamic State militants.
The Arab League this week called on its member states to combat the Islamic State threat, but did not explicitly back an expanded American military operation targeting the group.
It left room, however, for it to work with whatever approach Mr Obama lays out during his planned speech tomorrow on the eve of the 13th anniversary of the September 11 terror attacks.