At the White House Saturday, President Obama said he would seek congressional approval before taking action in Syria. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

President Obama pauses after answering questions from the news media during his meeting with Baltic leaders at the White House on Friday. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Michigan Rep. Kerry Bentivolio listens at a Nov. 4, 2012, rally in Livonia, Mich. The suburban Detroit congressman has said it would be a "dream come true" to seek the impeachment of President Obama. Paul Sancya/AP hide caption

itoggle caption Paul Sancya/AP

Ammunition was stacked up Saturday in an area near Damascus that is controlled by forces loyal to President Bashar Assad. Khaled al-Hariri /Reuters /Landov hide caption

itoggle caption Khaled al-Hariri /Reuters /Landov

Syrian activists — many wearing gas masks — looked for victims and evidence Thursday in an area near Damascus where government forces allegedly used chemical weapons. Reuters/Landov hide caption

itoggle caption Reuters/Landov

President Obama takes the stage at the University at Buffalo on Thursday. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP