The shrewd and articulate military commander, credited with turning around the Iraq war, will deliver a speech at Saint Anselm College in New Hampshire next week, a traditional staging post in the state where the first presidential primaries are held every four years. Each of the last eight presidents has spoken at the college on their way to victory.

It will be the latest in a series of speaking engagements where the head of the US Central Command region, which covers the Middle East and Central Asia, has veered well into foreign policy discussion and often faced questions about his political ambition.