Former President Bush, who was in office the time of the 9/11 attacks, is attending the Shanksville, Pennsylvania, memorial. Shanksville was the site of the Flight 93 crash.
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Ron Elving is Senior Editor and Correspondent on the Washington Desk for NPR News, where he is frequently heard as a news analyst and writes regularly for NPR.org.
Scott Detrow is a White House correspondent for NPR and co-hosts the NPR Politics Podcast.