The head of the U.S. Central Command told Congress Thursday that he believes more troops will be needed to help Afghan forces break their stalemate with the Taliban after more than 15 years of fighting.

Gen. Joseph Votel, testifying before the Senate Armed Services Committee, said he and ground commander Lt. Gen. Mick Nicholson have sent private recommendations to President Trump, but under questioning admitted the U.S. mission to support the Afghan Nation Army will need more trainers and advisers.