The leaders of the United States, Mexico, and Canada, also known as "the three amigos," are meeting in Mexico for a summit to discuss trade issues and the threat of drug gangs. President Barack Obama, Canadian Prime Minister Stephen Harper, and Mexican President Felipe Calderon will have dinner on Sunday night followed by talks on Monday. The main topics of discussion include boosting their economies, ensuring smooth trade, and addressing Mexican drug gangs that are active along the US border and into Canada. Jim Jones, Obama's national security adviser, does not expect major agreements to be announced at the summit, but sees it as a step towards future agreements. Calderon is likely to press Obama to resolve a cross-border trucking dispute. According to the North American Free Trade Agreement, Mexican trucks should be permitted to enter the United States, but American trucking companies argue that Mexican trucks are unsafe. This disagreement has been ongoing for many years. In response to the cancellation of a program allowing Mexican trucks to operate outside of the U.S. border zone, Mexico imposed tariffs on $2.4 billion worth of U.S. goods in March. U.S. business groups have been urging the White House to resolve the dispute, as they believe the ban could result in the loss of thousands of American jobs. Mexico's ambassador to the United States, Arturo Sarukhan, has expressed a desire for a final resolution to the trucking issue. He expressed his desire to reach an agreement by the end of the year. Michael Froman, a top official in the White House, informed reporters that the Obama administration is fully focused on the issue and is collaborating with the US Congress to address safety concerns. Canadian officials are expected to voice their worries about the "Buy American" components of a $787 billion economic stimulus bill that could potentially exclude Canadian companies from US construction contracts funded by the stimulus. Canada, being the United States' biggest trading partner, is concerned about this issue. Froman mentioned that the Obama administration is in talks with Canada and other countries to find a way to implement the 'Buy American' provision without violating the law or international agreements, while also minimizing trade disruptions. Obama addressed concerns about potentially reopening NAFTA by stating that it is not the right time to add labor and environmental protections due to the weakened economies of the three nations involved. He expressed interest in improving the treaty but emphasized that the focus should be on the difficult economic situation at hand. Another important issue discussed at the summit was the escalating violence caused by Mexican drug gangs, despite President Calderon's efforts to combat them. Police in the United States and Canada have attributed crime to the Mexican traffickers, with a higher death rate this year compared to 2008. Obama is supporting Calderon's actions against drug cartels, praising his courage and promising full support during a visit in April. Mexico is concerned about delays in receiving anti-drug equipment and training, and hopes the summit will help move things forward. The leaders will also discuss H1N1 swine flu and climate change as they prepare for international talks in Copenhagen in December.