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President Barack Obama greets Sophia and Isabella Strahan, the daughters of retired football player Michael Strahan, as he makes an unannounced appearance as first lady Michelle Obama hosts the 2015 winners of the Healthy Lunchtime Challenge for the Kids' State Dinner in the East Room at the White House, Friday, July 10, 2015, in Washington. (AP Photo/Andrew Harnik)

U.S. President Barack Obama greets patrons in Snow City Cafe in Anchorage, Alaska, September 1, 2015. Obama on Tuesday proposed a faster timetable for buying a new heavy icebreaker for the U.S. Arctic, where quickly melting sea ice has spurred more maritime traffic, and the United States has fallen far behind Russian resources.