At the time when his state was merged into the
Patiala and East Punjab States Union, the Maharaja had been given the position of
Rajpramukh (ceremonial governor) of PEPSU for life. However, in 1956, PEPSU disappeared from the map following a further reorganization of internal borders in India, and the Maharaja was summarily deprived of the responsibilities (and perks) of office. After 1956, the Maharaja was given various diplomatic assignments, including heading Indian delegations to the UN general assembly (1956),
UNESCO (1957–58) and
UNFAO (1959 onwards). He also served as ambassador to
Italy (1965–66) and the
Netherlands (1971–1974). These relatively minor assignments were significantly less than the assurances that the royals of India had received when they signed away their kingdoms, and from the absolute ruling powers to which the Maharaja had been accustomed. Further, the ruling
Congress party was championing a sharp turn left-wards in its policies, and its utterances with regard to the erstwhile princes were radical and alarming. Since Patiala was by far the largest of the princely states in
Punjab, the government had deemed it expedient to keep the Maharaja beholden (and away from politics) by giving him minor diplomatic assignments which required his presence abroad. The Maharaja was however anxious to gain some political leverage and influence in the ruling dispensation, but as a titular Maharaja, it was not possible for him to enter party politics himself. Meanwhile, Mehtab Kaur's father and family had risen in the ranks of the Congress party, building on the Riyasat
Praja Mandal background. For these reasons, and at her husband's behest, Mehtab Kaur entered party politics in 1964. Mehtab Kaur served as a member of
Rajya Sabha, the indirectly elected upper house of the Indian Parliament, from 1964 to 1967 as a
Congress party member. In 1967, she was elected to the
4th Lok Sabha (1967–71), the directly elected lower house of Parliament, from the
Patiala constituency. In 1971, the Congress party and its government executed some of their radical plans by individually 'de-recognizing' each and every one of the over 500 Maharajas who existed at that time in India. The privy purse (pension) and other benefits which had been guaranteed to them by solemn covenant in 1947–48, when they signed away their kingdoms, were summarily withdrawn as well. In keeping with
Indira Gandhi's anti-royal political stance, Mehtab Kaur was marginalized and was not given a party nomination to contest the general elections of 1971. Instead, the Maharaja was appointed ambassador to the
Netherlands that year, and the family again moved abroad. ==Later life==