Aziz returned to Pakistan in 1984 and served as a junior minister for Agriculture and Food Security until 1988 under the conservative Junejo administration. He was elected to the Senate of Pakistan in 1988 and re-elected in 1993 from the center-right PML-N, and served in both Sharif administrations first as the Minister of Finance from August 1990 to June 1993 and Minister of Foreign Affairs from August 1998 until 1999 coup d'état. He is noted as the only cabinet member who opposed the decision of conducting nuclear tests in response to India, citing 'economic reasons'. During his tenure as the Finance Minister he was noted a strong proponent of economic liberalization.