World leaders are meeting with President Obama in his hometown of Chicago for a two-day NATO summit focused heavily on Afghanistan.
Obama warned of the difficulty ahead as the summit confronted questions about Afghanistan's future. The summit kicked off on Sunday with a meeting between Obama and Afghanistan's President Hamid Karzai, the two key players to determine that future.
"We still have a lot of work to do and there will be great challenges ahead," Obama said. "The loss of life continues in Afghanistan and there will be hard days ahead."