All US troops in Afghanistan should be home by Christmas, President Donald Trump says.
The announcement came just hours after his national security adviser said Washington would reduce its forces in Afghanistan to 2500 by early next year.
A landmark deal between the United States and the Taliban in February said foreign forces would leave Afghanistan by May 2021 in exchange for counterterrorism guarantees from the Taliban, which agreed to negotiate a permanent ceasefire and a power-sharing formula with the Afghan government.
Trump and other officials have said the US will decrease to between 4000 and 5000 troops in Afghanistan around November.
Beyond that, officials have said that a reduction will depend on conditions in Afghanistan.
On Twitter, Trump said: "We should have the small remaining number of our BRAVE Men and Women serving in Afghanistan home by Christmas!"
It was unclear whether Trump was giving an order or verbalising a long-held aspiration.
Trump, who is seeking re-election next month, has made walking away from "ridiculous endless wars" the cornerstone of his foreign policy, even though thousands of troops remain in Iraq, Syria and Afghanistan.
The National Security Council and White House did not immediately respond to a request for comment.
The White House's plan for the drawdown will almost certainly be subject to review should Trump lose his bid for a second term in the November 3 election.