Rather than claiming authority that may not exist, Obama should act in concert with Congress.
209 airstrikes have been carried out in Iraq and 30 in Syria since Aug. 8.
The move came amid violence between Shiite rebels and the Sunni military.
Iraq's prime minister said foreign fighters were plotting to hit New York and Paris.
The estimate is higher than the figure the Pentagon gave last month.
"All the military might in the world will not eliminate this threat," Rep. Niki Tsongas said.
A contingent is helping in the search for treatment unit sites.
The Speaker says members "on their way out the door" lack accountability.
"We expect that they are going to react to the pressure that we put them under," Kirby said.
The Pentagon and White House have yet to offer estimates of the war's cost.
Officials said "initial indications" are "the strikes were successful."
Turkey had been reluctant to join the fight against ISIS.
Rep. Mac Thornberry is poised to become a leading GOP voice on national security.
The Obama administration had previously described the threat as "imminent."
The suspect's name was not given.
New ads feature testimonials from veterans who have served alongside Iowa GOP Senate hopeful.
Massachusetts House nominee Seth Moulton (D) released a campaign ad Thursday opposing sending U.S....
Ayotte wants U.S. to "aggressively go after revenue" from oil sales and criminal activity.
The senator said the U.S. should supply Ukraine with lethal military aid.
Leaders in Ankara had initially resisted U.S. calls to join an effort against the group.
Some members of Congress do not want to vote on using military force until after the midterms.
The little-known al Qaeda cell in northern Syria was targeted by U.S. airstrikes.
With more than 16 incidents per year since 2007, that's a 6.4 percent increase in frequency.
Rep. Adam Smith says the U.S. needs Sunni tribes in Iraq to support the nation's government.