President-elect Barack Obama plans to take his first international trip to Canada. Transition aides said Saturday that Obama picked the United States' northern neighbor as his first venture outside the country as president. Aides say they could not discuss the date for the trip or its agenda. A transition official says aides to the president-elect and Canadian Prime Minister Stephen Harper discussed the trip in recent days. But the official says Obama and Harper themselves have not directly discussed the trip. Obama meets Monday with Mexican President Felipe Calderon, his first in-person meeting with a world leader since winning election.