Through his Twitter page, the President stated:- "I have received with regret the resignation of Attorney General Prof. Githu Muigai.
"I thank him for his service for the last six and a half years. I have nominated as his replacement Judge Paul Kihara Kariuki."
Kenyatta also thanked the former AG for his years of service.
"I wish to place on record, on my own behalf and on behalf of the people of Kenya, our gratitude for the committed and dedicated service that Professor Muigai has accorded to our nation over the last six and a half years that he has served in the office of Attorney General.
"I wish Professor Muigai all the very best in the next phase of his professional career," stated the President.
The President also nominated Kennedy Ogeto as Solicitor General and appointed Njee Muturi as Deputy Chief of Staff.
He further announced the nomination of lawyer Abdikadir Mohammed as Ambassador to South Korea.
Prof Muigai has been quite vocal during President Kenyatta's regime and recently bashed the opposition for their 'swearing-in'.
Two weeks ago, the AG filed a petition at the Milimani Law Courts, challenging the constitutionality of NASA's People's Assemblies (Parliaments).
In the case filed under a certificate of urgency, the AG stated that the 15 People's Assemblies currently established are 'an illegality.'
The 15 counties sued in the petition include Mombasa, Kwale, Kilifi, Mandera, Kitui, Machakos, Makueni, Kakamega, Vihiga, Bungoma, Busia, Siaya, Kisumu, Homa Bay, Migori counties.
"The establishment of the People's Assemblies by the aforementioned County Assemblies is an illegality as the institution is alien to the Constitution and is neither established within the framework of the County Government's Act or any other legislation.