Iraq's new prime minister-designate won swift endorsements from uneasy mutual allies the United States and Iran on Tuesday as he called on political leaders to end crippling feuds that have let jihadists seize a third of the country.
Haider al-Abadi still faces opposition closer to home, where his Shia party colleague Nouri al-Maliki has refused to step aside after eight years as premier that have alienated Iraq's once dominant Sunni minority and irked Washington and Tehran.
However, Shia militia and army commanders long loyal to Maliki signaled their backing for the change, as did many people on the streets of Baghdad, eager for an end to fears of a further descent into sectarian and ethnic bloodletting.
More from GlobalPost: Hundreds of thousands of minorities in Iraq are fleeing the Islamic State (PHOTOS)
As Western powers and international aid agencies considered further help for tens of thousands of people driven from their homes and under threat from the Sunni militants of the Islamic State near the Syrian border, Secretary of State John Kerry said the United States would consider requests for military and other assistance once Abadi forms a government to unite the country.
Underscoring the convergence of interest in Iraq that marks the normally hostile relationship between Washington and Iran, senior Iranian officials congratulated Abadi on his nomination, three months after a parliamentary election left Maliki's bloc as the biggest in the legislature. Like Western powers, Shia Iran is alarmed by Sunni militants' hold in Syria and Iraq.
"Iran supports the legal process that has taken its course with respect to choosing Iraq's new prime minister," the representative of Supreme Leader Ayatollah Ali Khamenei on the Supreme National Security Council was quoted as saying.
"Iran favors a cohesive, integrated and secure Iraq," he said, adding an apparent appeal to Maliki to concede.
Abadi himself, long exiled in Britain, is seen as a far less polarizing, sectarian figure than Maliki, who is also from the Shia Islamic Dawa party. Abadi appears to have the blessing of Iraq's powerful Shia clergy, a major force in the land since US troops toppled Sunni dictator Saddam Hussein in 2003.
Iraqi state television said Abadi "called on all political powers who believe in the constitution and democracy to unite efforts and close ranks to respond to Iraq’s great challenges."
One politician close to Abadi told Reuters that the prime minister-designate had begun contacting leaders of major groups to sound them out on forming a new cabinet. The president said on Monday he hoped he would succeed within the next month.
Maliki angrily dismissed Abadi's nomination on Monday as illegal. But there was no further sign of opposition on Tuesday.
A statement from a major Shia militia group, Asaib Ahl Haq, which has backed Maliki and reinforced the Iraqi army as it fell back from the north in June, called for an end to the legalistic arguments of the kind used by Maliki to justify his retaining power and urged "self-restraint by all sides."
It said leaders should "give priority to the public interest over the private" and respect the guidance of clerical leaders — a clear reference to Grand Ayatollah Ali al-Sistani's indication that he favors the removal of Maliki to address the national crisis.
While US officials have been at pains not to appear to be imposing a new leadership on Iraq, three years after US troops left the country, President Barack Obama was quick to welcome the appointment. Wrangling over a new government since Iraqis elected the new parliament in April has been exploited by the Islamic State to seize much of the north and west.
Obama has sent hundreds of US military advisers and last week launched air strikes on the militants after they made dramatic gains against the Peshmerga forces of Iraq's autonomous ethnic Kurdish region, an ally of the Baghdad authorities.
US officials have said the Kurds are also receiving direct military aid, and US and British aircraft have dropped food and other supplies to terrified civilians, including from the Yazidi religious minority, who have taken refuge in remote mountains.
More from GlobalPost: This man has lost 63 relatives to the Islamic State
Kerry, who on Monday had warned Maliki not to resort to force to hold on to power, said on Tuesday that Abadi could win more US military and economic assistance.
"We are prepared to consider additional political, economic and security options as Iraq's government starts to build a new government," he told a news conference in Australia, where he also reaffirmed that Washington would not send combat troops.
"The best thing for stability in Iraq is for an inclusive government to bring the disaffected parties to the table and work with them in order to make sure there is the kind of sharing of power and decision-making that people feel confident the government represents all of their interests," Kerry added.