Brussels

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A Belgian police officer guards the building of the European Commission in Brussels, Belgium, Tuesday, Nov. 24, 2015. Brussels is keeping its terror alert at the highest level. (AP Photo/Michael Probst)

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Secretary of Defense Ash Carter and Air Force Gen. Paul J. Selva, vice chairman of the Joint Chiefs of Staff, honor the three men, including two U.S. service members, who stopped a gunman on a Paris-bound train outside of Brussels last month.

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Greek Prime Minister Alexis Tsipras said on arrival at the summit in Brussels that he wanted "another honest compromise" to keep Europe united. (Associated Press)

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French President Francois Hollande, center, arrives for a meeting of the European Socialists prior to an emergency EU summit in Brussels on Thursday, April 23, 2015. (AP Photo/Francois Walschaerts) ** FILE **

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In this Tuesday, March 23, 2010, file photo, the Google logo is seen at the Google headquarters in Brussels. (AP Photo/Virginia Mayo, File)

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German Finance Minister Wolfgang Schaeuble speaks with the media as he arrives for a meeting of Eurogroup finance ministers at the EU Council building in Brussels, Monday, Feb. 16, 2015. (AP Photo/Virginia Mayo)

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Prime Minister David Cameron, with German Chancellor Angela Merkel and US President Barack Obama at the G7 Summit in Brussels. (photo courtesy of Cameron's Flickr page)

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FILE - In this hand out file photo distributed on Sunday, May 25, 2014 by the Belgian Federal Police, a surveillance camera shows a man shooting at the Jewish museum in Brussels, Belgium, on Saturday, May 24, 2014. The Paris prosecutor's office said a man has been arrested Friday May 30, 2014 in the investigation of the shooting at the Jewish museum in Brussels that left at least three people dead. (AP Photo/Belgian Federal Police, File)