Workers unload medical supplies to fight the Ebola epidemic from a USAID cargo flight in Harbel, Liberia, in August. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Yemeni soldiers hold up their weapons at an area seized from al-Qaida in the southeastern province of Shabwa, Yemen, on May 8. President Obama said Wednesday that U.S. strategy against the so-called Islamic State would be similar to how it targeted militants in Yemen and Somalia. Yemen's Defense Ministry/AP hide caption

itoggle caption Yemen's Defense Ministry/AP

A young Iraqi on Thursday stands amid the debris of a double car bomb attack in Baghdad. There was no immediate claim of responsibility. President Obama's plan to attack Islamic State militants in Iraq and Syria will require help from partners on the ground in both countries. Ahmad Al-Rubaye/AFP/Getty Images hide caption

itoggle caption Ahmad Al-Rubaye/AFP/Getty Images

House Speaker John Boehner, R-Ohio, on Capitol Hill on Thursday. Boehner says Congress stands ready to work with the president on the threat from Islamic State militants. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

President Obama delivers a prime-time address from the Cross Hall of the White House on Wednesday. He pledged to lead a broad coalition against the Islamic State insurgents and vowed to target the terrorist group with airstrikes "wherever they exist." Saul Loeb/DPA/Landov hide caption

itoggle caption Saul Loeb/DPA/Landov

In this image made through a window of the Oval Office, President Obama speaks on the phone to Saudi Arabia's King Abdullah on Wednesday. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Secretary of State John Kerry arrives at Queen Alia International Airport in Amman, Jordan, on Wednesday, ahead of a stop in Iraq. Kerry is hoping to nail down support for a U.S. plan to combat the Islamic State insurgency in Iraq and Syria. Reuters/Landov hide caption

itoggle caption Reuters/Landov

A U.S. military plane lands Aug. 11 on the U.S. Navy aircraft carrier USS George H.W. Bush in the Persian Gulf. U.S. public support of airstrikes against Islamic militants jumped sharply, according to a new poll, as President Obama prepares a strategy. Hasan Jamali/AP hide caption

itoggle caption Hasan Jamali/AP

Arab League Secretary-General Nabil Elaraby (foreground) speaks to the head of the Syrian Coalition (second from right) during a meeting in Cairo, Egypt, on Monday. Elaraby is urging the league's members to confront Islamic State extremists. Amr Nabil/AP hide caption

itoggle caption Amr Nabil/AP

President Obama said at a White House news conference Thursday that Russia is to blame for the violence in eastern Ukraine. Larry Downing /Reuters /Landov hide caption

itoggle caption Larry Downing /Reuters /Landov

Attorney General Eric Holder talks with Ferguson, Mo., residents Angela Whitman (left) and Jill Richards on Wednesday at Drake's Place Restaurant about issues surrounding the shooting of Michael Brown. J.B. Forbes/MCT/Landov hide caption

itoggle caption J.B. Forbes/MCT/Landov

President Obama said Wednesday that the extremist group that carried out the beheading of U.S. journalist James Foley engages in "cowardly acts of violence" and "has no place in the 21st century." Kevin Lamarque/Reuters/Landov hide caption

itoggle caption Kevin Lamarque/Reuters/Landov