Question: Which former President of Pakistan was Prime minister when the Sixth Amendment was adopted by the Parliament of Pakistan on December 22, 1976?

Context paragraphs:
Sixth Amendment to the Constitution of Pakistan: The Sixth Amendment to the Constitution of Pakistan (Urdu: آئین پاکستان میں چھٹی ترمیم) was adopted by the elected Parliament of Pakistan on December 22, 1976, under the government of Prime minister Zulfikar Ali Bhutto.  The "VI Amendment" stated that Chief Justice of Supreme Court will be retired at the age of 65 and a High Court honorable judge shall be retired at the age of 62.

Mian Kifait Ali: Major Mian Kifait Ali (July 1902 – 1 December 1994) was a pioneer of the Pakistan movement, his masterpiece book ""Confederacy of India"" published in 1939, under the pen name "A Punjabi" was the first to deal with political, economic and administrative aspects of Pakistan.  He was amongst the first to respond to the call of Pakistan sounded by Muhammad Iqbal in 1930 (Qutote from Chaudhry Muhammad Ali, Prime Minister of Pakistan), Dr. Khursheed kamal aziz Pakistan's official historian) has described this book as "the most comprehensive and far reaching scheme aimed at furthering and elaborating the idea of Pakistan.  Waheed uz-Zaman wrote in his book, "Pakistan", Lahore, 1964, P. 168, "The book was taken into consideration by the Muslim league, while preparing the Lahore resolution and the fact the solution proposed in the confederacy of India" differed but little from the proposed by the Muslim League in March 1940.  The venear of a Confederacy, which was the main theme of his scheme, could anytime be set aside and the remainder would have precisely... Pakistan.  So scholarly and so cogent was his reasoning that men like Dr.Rajendra Prasad felt compelled to join issues with him in his books, ("Pakistan"(Bombay and Calcutta, September 1940), p 34; see also his book ""India Divided"" page 180-181).  The book was reviewed in leading newspapers and journals.  Comparatively more scholarly appraisal was in the "Tarjaman-ul-Quran" of Maulana Abul Ala Maududi.  According to Mian Kifait Ali "The idea was suggested to me by the late Choudhary Rahmat Ali's writings and I developmed it to an extent to which no one had done earlier (Letter to Dr. K.K, September 5, 1968)".  Ali also stated that originally it was proposed to publish the book under the title of "Pakistan" a typed manuscript which bore this page title was sent to the press.  Soon after he received a telegraphic message from the Muhammad Ali Jinnah that book should not appear under the pen name of "Pakistan".  It was to comply with the Quaid's directive he prepared a federal scheme and was incorporated in the introduction of the book.  Thus the book was titled as "Confederacy of India".  (Nation article, 23 December 1994 by Sarfraz Hussain Mirza, ""Confederacy of India by A Punjabi"", also in Daily Times, Cam Diary, ""Pak history in Leichester"", and article by V.P Bhatia ""'Jinnah was against the name 'Pakistan' at First"".  It was in recognition of this work of Mian Kifait Ali that he was invited to work on the committee presided over by Sir Abdullah Haroon set up in February 1940 to examine the various schemes of constitutional reforms for India and to see whether a consolidated scheme can finally be framed.  His book has been referred to as the most comprehensive schemes at demystifying and detailing the ideas regarding the inception of Pakistan, quite a lot has been written about him and his work.  Mian Kifait Ali has done "pioneering work in the evolution of Muslim political thoughts and has suffered the hardship of a pioneer… when an objective appraisal of Muslim political movement is made by the historian.  He will find an honourable place among the pioneers and selfless workers in this great field of Muslim reconstruction (Quoted by Governor Punjab, Mushtaq Ahmed Gurmani).  Famous independence-era personalities such as Abul Ala Maududi, Chaudhry Muhammad Ali, Dr. Rajendra Prasad, Vengalil Krishnan Krishna Menon, and Sardar V. Patel took issue with him.  He responded in several pamphlets.

Mian Habib Ullah: Mian Habib Ullah (Born April 30, 1948) is a Pakistani businessman and diplomat belonging to Chiniot and is best known for his association with the Islamabad Stock Exchange and Export Promotion Bureau (Trade Development Authority, Government of Pakistan).  He was also a founding member of Islamabad Stock Exchange.  He is the current Honorary Consul General of Republic of Cyprus also elected as the Dean of the Diplomatic Corps of Honorary Consuls and Consul Generals in November 2014.  Mian Habib Ullah is former Minister of State and Former, President of Federation Of Pakistan Chamber of Commerce & Industry (FPCCI) and also Former President of Rawalpindi Chamber of Commerce & Industry.  He was closely associated with Prime Minister, Benazir Bhutto in her second term and also served as her Advisor on trade.  He is also the Former President of All Pakistan China Friendship Association .

Third Amendment to the Constitution of Pakistan: The Third Amendment Amendment to the Constitution of Pakistan (Urdu: آئین پاکستان میں تیسری ترمیم) is an amendment to the Constitution of Pakistan went effective on 18 February 1975, under the of elected Prime minister Zulfikar Ali Bhutto an amendment to the 1973 Constitution of Pakistan The amendment extend the period of preventive detention, of those who are accused of committing serious cases of treason and espionage against the state of Pakistan, are also under trial by the government of Pakistan.  The "III Amendment" protect against the abuse of government authority in legal procedure, and extended the investigation period from one month to three month.

List of Presidents of Pakistan: The President of Pakistan is the head of state of the Islamic Republic of Pakistan.  According to the Constitution of Pakistan, the President has "powers, subject to Supreme Court approval or veto, to dissolve the National Assembly, triggering new elections, and thereby dismissing the Prime Minister".  These powers were repeatedly modified through amendments to the constitution, which were introduced as the results of military coups and changes in government.  Since the 18th Amendment to the Constitution was passed in 2010, Pakistan has been shifted back from semi-presidential to a parliamentary democratic republic.  Under that system, the president has limited ruling powers, and performs ceremonial duties while the Prime Minister enjoys more powers to execute decisions.  The president is chosen by the Electoral College composed of the Senate, the National Assembly and the Provincial Assemblies.

Fifth Amendment to the Constitution of Pakistan: The Fifth Amendment to the Constitution of Pakistan (Urdu: آئین پاکستان میں پانچویں ترمیم) was adopted in September 5 of 1976, by the elected Parliament of Pakistan under the democratic government of Zulfikar Ali Bhutto.  The "V Amendment" widen the scope of restriction on the Pakistan High Courts to strip powers of the High Courts to enforce the grants of natural fundamental rights explained in Chapter I, Part II of the Constitution.  This amendment also imposed the import and sales tax on the consumer product.  "V Amendment" also restricted the eligibility of the Governor or the Chief minister of those who are not from the provinces in which they have fought the elections for the respected offices.  "V Amendment" also set the maximum age of the Chief Justice as well as the term of serving the respected office.

Ömürbek Babanov: Ömürbek Toktogulovich Babanov (Kyrgyz: Өмүрбек Токтогулович Бабанов; born 15 January 1970) is a Kyrgyz politician who was Prime Minister of Kyrgyzstan from 1 December 2011 to 1 September 2012.  Before his appointment as Prime Minister, he was Deputy Prime Minister in the Government of Almazbek Atambayev.  He was also acting Prime Minister from 23 September 2011 until 14 November 2011, as the Prime Minister Atambayev was a candidate in the presidential election.  He again became acting Prime Minister on 1 December 2011 when Atambayev took office as President.  He was confirmed by Parliament on 23 December 2011.  On 1 September 2012 Babanov resigned as Prime Minister.

Zulfikar Ali Bhutto: Zulfikar Ali Bhutto (Urdu: ‎ ; Sindhi: ذوالفقار علي ڀُٽو‎ ) ] ) (5 January 1928 – 4 April 1979) was a Pakistani politician who served as Prime Minister of Pakistan from 1973 to 1977, and prior to that as the fourth President of Pakistan from 1971 to 1973.  He is revered by his followers in Pakistan as Quaid-i-Awam (Urdu: ‎ People's Leader).  He was also the founder of the Pakistan People's Party (PPP) and served as its chairman until his execution in 1979.

Seventh Amendment to the Constitution of Pakistan: The Seventh Amendment to the Constitution of Pakistan (Urdu: آئین پاکستان میں ساتویں ترمیم) was adopted by the elected Parliament of Pakistan on 16 May 1977, a month before the ending of ending of the democratic government of Prime minister Zulfikar Bhutto.  The "VII Amendment" was also the last of seven amendments that were adopted the elected Parliament and enforced by the Government of Prime minister Zulfikar Ali Bhutto.  The "VII Amendment" orders and enables the people elected Prime Minister to obtain a Vote of confidence by the people elected members of Parliament.  The "VII Amendment" also constitutionally orders the people elected President to hold a national referendum for the approval of Prime minister if he or she fails to secure the vote of confidence of the members of Parliament.

Fourth Amendment to the Constitution of Pakistan: The Fourth Amendment to the Constitution of Pakistan (Urdu: آئین پاکستان میں چوتھی ترمیم) is an amendment that became part of the Constitution of Pakistan on November 21, 1975, under the Government of Prime minister Zulfikar Ali Bhutto.  The "IV Amendment" decreed the seats for minorities and non-Muslims representation to the government of Pakistan and the Parliament of Pakistan, to protect the minority rights in the country.  The "IV Amendment" also deprived courts of the power to grant bail to any accused or innocent [person] until proven guilty under any preventive detention.  The "IV Amendment" protect the rights of Minorities in the country, and also protect the rights of accused [person] until proven guilty from the police brutality during the subsequent investigations.

Supporting paragraphs: Sixth Amendment to the Constitution of Pakistan Zulfikar Ali Bhutto
Answer: Zulfikar Ali Bhutto