Washington ? The war in Afghanistan will get worse before it gets better, President Barack Obama warned on Wednesday, but he declared his plan to begin withdrawing U.S. forces next year remains on track.

Standing alongside Afghan President Hamid Karzai, Obama said, “What I’ve tried to emphasize is the fact that there is going to be some hard fighting over the next several months.” The two leaders spoke at a White House news conference as U.S.-led forces in Afghanistan prepare to push hard into the Taliban’s birthplace in Kandahar province in June. The campaign for Kandahar, already under way in districts outside the city, is expected to be among the bloodiest of the nearly 9-year-old war.

“There is no denying the progress,” Obama said. “Nor, however, can we deny the very serious challenges still facing Afghanistan.”