Canadian Prime Minister Justin Trudeau, first lady Sophie Gregoire-Trudeau and their children arrive at Joint Base Andrews, Md., March 9, 2016. Trudeau’s visit is the first time in approximately 20 years a Canadian Prime Minister has arrived in the U.S. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Peter Selfridge, U.S. State Department’s Chief of Protocol, greets Canadian Prime Minister Justin Trudeau at Joint Base Andrews, Md., March 9, 2016. Trudeau’s arrival is the beginning of a three-day official visit to reinvigorate U.S.-Canadian relations. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau is greeted by Canadian Embassy representatives and Joint Base Andrews leadership at JBA, Md., March 11, 2016. Trudeau arrives for his first U.S. state visit as Canada’s newest PM to strengthen U.S.-Canadian relations. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau and first lady Sophie Gregoire-Trudeau are greeted with flowers by Jalique Wiseman and Aniya Walker, WB Patterson Elementary School students, at Joint Base Andrews, Md., March 11, 2016. Trudeau arrives for his first U.S. state visit as the Prime Minister of Canada. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau, his family and Peter Selfridge (right), U.S. State Department’s Chief of Protocol, stand for the U.S. and Canadian national anthems at Joint Base Andrews, Md., March 9, 2016. Trudeau’s visit is the first time in approximately 20 years a Canadian Prime Minister has arrived in the U.S. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau is greeted by District of Columbia school children at Joint Base Andrews, Md., March 11, 2016. Trudeau arrives in the U.S. for a three-day state visit with President Barack Obama to strengthen U.S.-Canada relations. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau greets a crowd of local school children at Joint Base Andrews, Md. March 9, 2016. Trudeau’s arrival began a three-day official visit strengthening U.S.-Canada relations. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Canadian Prime Minister Justin Trudeau waves goodbye as he boards his plane at Joint Base Andrews, Md., March 11, 2016. Trudeau leaves after completing a three-day state visit with U.S. President Barack Obama to strengthen U.S.-Canada relations. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)