US President Barack Obama has arrived in Afghanistan on a previously unannounced visit.
He and Afghan President Hamid Karzai have signed a 10-year accord charting future relations between the countries.
The agreement outlines the US role in Afghanistan after 2014, when most NATO combat forces are due to pull out.
Anchor Marco Werman gets details from Caroline Wadhams, senior fellow at the Center for American Progress in Washington. (Recorded at 4pm EDT)
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