The leaders of the United States, Mexico, and Canada, known as "the three amigos," are meeting for a summit in Mexico to discuss trade issues and the threat of drug gangs. President Barack Obama, Canadian Prime Minister Stephen Harper, and Mexican President Felipe Calderon are convening in Guadalajara for dinner on Sunday night, followed by trilateral talks on Monday. Their main focus is on boosting their economies, maintaining smooth trade, and addressing the issue of Mexican drug gangs operating across US borders into Canada. Jim Jones, Obama's national security adviser, does not anticipate any major agreements to be announced at the summit, but sees it as a step towards future agreements. Calderon is expected to pressure Obama to resolve a cross-border trucking dispute. According to the North American Free Trade Agreement, Mexican trucks are supposed to be able to enter the United States, but American trucking companies argue that Mexican trucks are not safe. This issue has been ongoing for years. In response to the cancellation of a program allowing Mexican trucks to operate beyond the U.S. border zone, Mexico imposed $2.4 billion in tariffs on US goods in March. US 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, stated that they are looking for a final solution to the issue of trucking. He stated his desire for an agreement by the end of the year. A senior White House official, Michael Froman, informed reporters that the Obama administration is highly focused on the issue and is collaborating with the US Congress to address safety concerns. Canadian officials are anticipated to express 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 is the top trading partner of the United States. Froman mentioned that the Obama administration is in discussions with Canada and other countries to ensure that the "Buy American" provision is implemented in a manner that complies with the law and international obligations, while also minimizing trade disruptions. Obama addressed a potential concern before his trip by stating that he is not currently considering unilaterally reopening the North American Free Trade Agreement (NAFTA) to add labor and environmental protections, as some in his party would prefer. He acknowledged the difficult economic situation and expressed interest in improving the treaty in the future. Another important issue at the summit is how to address the escalating violence caused by Mexican drug gangs, despite President Calderon's efforts to combat them. Obama is supporting Calderon's actions in going after drug traffickers, praising his courage. During a visit in April, Obama promised full support to Calderon. However, Mexico is complaining that the anti-drug equipment and training are taking too long to arrive, and they hope the summit will help move things forward. The leaders also plan to address the H1N1 swine flu and climate change in preparation for international talks in Copenhagen in December.