The Justice Department announced Tuesday that it will not seek the death penalty against Ahmed Abu Khattala, 54, a U.S.-designated terrorist whom prosecutors accuse of leading the 2012 attacks in Benghazi, Libya, that killed four Americans. The announcement, contained in a notice to the federal trial court in Washington, clears the way for a major terrorism trial in the nation’s capital, the first in the U.S. since 2015, barring a plea agreement by Abu Khattala. The decision ended a lengthy review after President Obama aired concerns in October that while he supported capital punishment in theory, he found it “deeply...