[2][3] He served as a member of the Rajya Sabha for two terms: 1970 to 1976 and 1976-1982,[4] representing India at the United Nations and other international forums.

As a member of the Rajya Sabha, he held a position on the Public Accounts Committee during the years 1981-82, under the chairmanship of Satish Chandra Agarwal.

[5] Khan was recognized for his unwavering advocacy for a federal system of governance, establishing himself as a prominent scholar on the subject in the subcontinent.

He contended that India can be best described as a multi-regional federation, and he rejected the notion that nationality and ethnicity alone can sufficiently explain the country's socio-cultural diversities.

Khan emphasized that India's regions possess unique social, cultural, historical, linguistic, economic, and political characteristics.