On Thursday in Brussels, President Trump will meet for the first time with leaders of the European Union and NATO, the 27-member alliance he once dismissed as "obsolete." Trump arrived in Brussels on Wednesday, after a stop in Italy, and after meeting at the European Union headquarters with European Council president Donald Tusk and European Commission head Jean-Claude Juncker on Thursday morning, Trump will have a private lunch with new French President Francois Macron then gather with fellow NATO leaders. Trump says he wants to get a NATO commitment to join the fight against the Islamic State, and NATO will almost certainly agree, though some members won't commit military support to the ISIS fight.