In this April 23, 2015, file photo, President Obama pauses while speaking in the Brady Press Briefing Room of the White House in Washington, where he took full responsibility for deaths of American, Italian hostages, and expressed apologies. The accidental killing of two hostages in a U.S. counterterrorism operation against al Qaeda has raised pressure on the White House to revise the nation’s oft-criticized strategy for dealing with abducted Americans. (AP Photo/Pablo Martinez Monsivais, File)