The leaders of the United States, Mexico, and Canada, also 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 will have dinner on Sunday night followed by talks on Monday. Their main focus is on boosting their economies, maintaining smooth trade, and addressing Mexican gangs involved in the drug trade across borders. Obama's national security adviser, Jim Jones, does not expect major agreements to be announced at the summit, but sees it as a step in ongoing discussions that will lead to agreements in the future. Calderon is likely to press Obama to resolve a cross-border trucking dispute. According to the North American Free Trade Agreement, Mexican trucks are supposed to be permitted to enter the United States, but American trucking companies claim that Mexican trucks are not safe. This issue has been ongoing for years. In response to Obama canceling a program allowing Mexican trucks to operate beyond the U.S. border zone, Mexico imposed retaliatory tariffs of $2.4 billion 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, expressed the desire for a final resolution to the trucking issue. He mentioned that he wants an agreement to be reached by the end of the year. Michael Froman, a top official at the White House, informed reporters that the Obama administration is giving significant attention to 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, which they believe could exclude Canadian companies from US construction contracts funded by the stimulus. Canada is the largest trading partner of the United States. Froman stated that the Obama administration is in discussions with Canada and other countries to implement the 'Buy American' provision in a manner that complies with the law and international obligations, while also minimizing trade disruptions. Obama addressed concerns about potentially reopening NAFTA during his trip, stating that due to the weakened economies of the three nations involved, now is not the time to add enforceable labor and environmental protections to the treaty. He expressed interest in improving the treaty but emphasized that the focus should be on the challenging economic situation at hand. Additionally, discussions at the summit included addressing the issue of Mexican drug gangs, who have been responsible for a significant increase in violence and crime in the region. Obama is supporting Calderon's actions in going after drug traffickers and has praised Calderon's courage. Obama has promised to fully support Calderon during a visit in April, but Mexico is expressing concerns that anti-drug equipment and training are not arriving quickly enough. The leaders are also planning to discuss the H1N1 swine flu and address climate change together as they prepare for international talks in Copenhagen in December.