KABUL, Afghanistan (AP) — A series of security problems and difficult fractures in relations with Afghan leaders plagued Defense Secretary Chuck Hagel’s first trip here as Pentagon chief, including the Afghan president’s accusations that the U.S. and the Taliban are working in concert to show that violence in the country will worsen if most coalition troops leave.

The top U.S. commander in Afghanistan, Gen. Joseph Dunford, quickly rejected the charges President Hamid Karzai made Sunday as “categorically false.” But the accusations were just the latest in a series of disputes that have frayed relations between the two nations as the U.S. works to wind down the war and turn the country’s security over to the Afghans.

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