US President Barack Obama has phoned the leaders of Canada, Britain and Saudi Arabia. White House press secretary Robert Gibbs said Friday that Obama had talked with Canadian Prime Minister Stephen Harper, British Prime Minster Gordon Brown and Saudi King Abdullah. Obama plans to make his first international trip as president to Canada, a key ally that shares a border with the United States. The trip will keep with tradition, with most US presidents making Canada their first stop. Britain and Saudi Arabia also are longtime allies of the United States. Earlier this week, Obama talked with Israeli, Palestinian, Egyptian and Jordanian leaders about the cease-fire between Israel and Hamas in Gaza.