President Obama is arriving in Mexico City ready to unveil his support for the Inter-American Arms Treaty aimed at reducing the flow of guns to cartels. The plan "addresses a key hemispheric concern relating to people's personal security and well-being," an administration official said. Obama's trip to Mexico is more fraught with heady issues than his recent much-hyped trip to the G-20 summit in Europe. Aside from curtailing drugs and gun sales, top issues on the agenda are civil unrest in Mexico, the economic crisis, immigration, cross-border trucking, and clean energy challenges. "We are going to be dealing not only with drug interdiction coming north, but also working on helping to curb the flow of cash and guns going south," Obama said of drug policy ahead of his departure. More than 10,000 people have been killed since 2006 in drug-related violence in Mexico.