The Pentagon will send nearly 4,000 additional troops to Afghanistan in an effort to turn around a war that commanders have described as a stalemate, the Associated Press reported Thursday.

Earlier this week, President Trump provided his defense secretary, Jim Mattis, with the authority to determine troop levels in Afghanistan.

The Pentagon is reviewing the strategy for Afghanistan, which Mattis said may take several weeks. But the question of sending additional troops is considered urgent in order to halt recent Taliban advances as another fighting season gets underway. The Taliban generally steps up violence in the warm months, when snows melt and roads become passable.

The AP cited a Trump administration source who was not authorized to discuss the decision publicly and said the decision could be announced as early as next week.