The president has also faced persistent calls to take military action in Syria on humanitarian grounds, given that more than 170,000 people have been killed there.
Critics, including some Republicans in Congress, have argued that Obama's cautious approach to Syria has allowed the Islamic State group to flourish there, growing strong enough to move across the border with Iraq and make swift gains.
Republican Sens. John McCain of Arizona and Lindsey Graham of South Carolina praised Obama's proposed actions Thursday night but said much more will be necessary.
"This should include the provision of military and other assistance to our Kurdish, Iraqi, and Syrian partners" who are fighting the militants, airstrikes against the militants' leaders and forces and support for Sunni Iraqis who seek to resist the extremists, they said in a statement.