The summit happens not every year but most years, or it has happened most years, or every year or two, for the past decade or more. It's colloquially known as the “three amigos” summit. The last time it took place was in February 2014 when the Mexican president, President Pena Nieto, hosted in his hometown in Mexico. The agenda tends to focus on economic prosperity. That's the essence of the ties that have bound the three countries together ever since NAFTA came into force 21 years ago. There are, of course, also larger environmental issues. I think you'll see climate change featuring heavily on the agenda this year. The new government has come into office and will be pursuing a North American clean energy and environment agreement within the trilateral context.
Security issues are always at the fore. The U.S. has concerns about both its southern and its northern borders. Increasingly, I think you'll see an emphasis on North America as an actor in international affairs. I think you would have seen some of this coming out of the recent North American foreign ministers' meeting in Quebec City, which took place two weeks ago, at which the three foreign ministers in their statements mentioned Colombia and the peace process there. They mentioned Central America, and they mentioned the Carribean. Increasingly I think you'll see the three North American countries talking about their neighbours.