Mattis: US reached decision on Afghan strategy after 'rigorous' debate

US Defence Secretary Jim Mattis confirmed Sunday that the Trump administration had decided on a new strategy for Afghanistan after "rigorous" debate, but said President Donald Trump would be the one to announce it.Mattis refused to hint at any details of the decision, which came after months of speculation over whether Trump, frustrated with a stalemate after 16 years in Afghanistan, would allow the Pentagon to boost troop numbers on the ground in the country.