Ten days after ordering air strikes against the jihadist fighters, Obama warned that IS remained a threat to Iraq and the wider region, telling Baghdad "the wolf is at the door".
Previously, Obama had been at pains to describe the US operation as limited but, as US jets pounded IS positions outside Mosul, he said it would form part of a broader political strategy.
"We will continue to pursue a long-term strategy to turn the tide against ISIL by supporting the new Iraqi government and working with key partners in the region," he said, using one of the group's acronyms.
Obama repeated his support for new Iraqi Prime Minister Haidar al-Abadi's attempts to form a more inclusive government, but warned he must act quickly to undercut support for the radicals.
"I was impressed in my conversation with him about his vision for an inclusive government but they've got to get this done because the wolf's at the door," he told reporters.
"In order for them to be credible with the Iraqi people, they're going to have to put behind some of the old practices and actually create a credible united government."
Obama said "our goal is to have effective partners on the ground. And if we have effective partners on the ground, mission creep is much less likely", and promised a joint "counter-terrorism" strategy with Iraq and US allies.
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