KABUL, Afghanistan — President Ashraf Ghani’s national security adviser abruptly resigned on Saturday amid reports that Mr. Ghani was firing his entire war cabinet.
Shah Hussain Mortazavi, a spokesman for the Afghan leader, confirmed that Mr. Ghani had accepted the resignation of the national security adviser, Hanif Atmar, and appointed Hamdullah Mohib, the current ambassador to the United States, as his replacement.
Mr. Mortazavi refused to comment on a report by Tolonews, a prominent local television channel, that Mr. Ghani had fired all his security ministers including, in addition to Mr. Atmar, Minister of Defense Tariq Shah Bahrami; Minister of Interior Wais Barmak; and Masoom Stanekzai, the head of the National Directorate for Security, Afghanistan’s intelligence agency. Mr. Stanekzai and Mr. Atmar held cabinet-level posts.
“For now, we only can confirm Mr. Atmar’s resignation,” Mr. Mortazavi said. “I can’t say anything about Mr. Stanekzai.”
The Tolonews report said that Mr. Ghani took the action because of dissatisfaction with Tuesday’s rocket attack on the presidential palace as he was making a speech, with his security agencies’ handling of the Taliban effort to take over the southeastern city of Ghazni, and with rising casualty rates among Afghan security forces.
Other officials dismissed the Tolonews report as “rumors.”
Tolonews published a copy of Mr. Atmar’s handwritten resignation letter, in which he said that he was acting “because of serious disagreement with the policies and methods of the top level of government” and that those disagreements went back several months.
Mr. Atmar, who had worked as Mr. Ghani’s top security official since 2014, is widely rumored to be considering a run for president in next year’s elections.
Mr. Mohib, 35, the new national security adviser, has been ambassador to Washington since 2015. A computer engineer, he has no previous security experience.
Fatima Faizi reported from Kabul, Afghanistan, and Rod Nordland from London.