Presidency sources said Buhari is shocked that the content of a supposed private letter to him was leaked to the media.
In the memo, which was leaked to the media last Thursday, el-Rufai criticised the President and the party for poor handling of issues of governance.
According to The Sun, the Presidency and the APC are yet to find the appropriate words to reply the Governor.
The newspaper, citing a 'highly placed official' in the presidency, said Buhari is shocked that the content of a supposed private letter to him was leaked to the media.
The National Publicity Secretary, Mallam Bolaji Abdullahi, had said given the number of pages and the issues raised in the memo, the National Working Committee (NWC) of the party would need some time to study it before responding.
In the memo, dated September 22, 2016, el-Rufai, a staunch loyalist of the President noted that his warning becomes necessary because his political future is intrinsically tied to that of Buhari, adding that: "poll after poll in Kaduna State, before and after the 2015 elections, clearly shows that my fate, politically and otherwise, is uncannily tied to yours. If you do well, I stand to benefit immensely. If you do not do well sir, whatever I try to do in Kaduna matters little to my present and any future political trajectory."
"There is a perception that your ministers, some of whom are competent and willing to make real contributions, have no clear mandate, instructions and access to you. Ministers are constitutional creations, Mr. President, and it is an aberration that they are expected to report to the Chief of Staff on policy matters," el-Rufai said.
He also echoed the insinuation in some quarters that appointments into Buhari’s government was lopsided, in favour of a particular section of the country, saying: "There is a strong perception that your inner circle or kitchen cabinet is incapable, unproductive and sectional. The quality and the undue concentration of key appointments to the North-East and exclusion of South-East are mentioned as evidence of this."
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However, the APC said the party will make its comments public after studying the memo, adding that the legitimate views of the governor has turned out to be of concern to Nigerians.