ISLAMABAD, Pakistan — The interim prime minister of Pakistan, picked to temporarily replace his corruption-scarred predecessor, said Tuesday that he had no choice but to take the job but that he was no “bench warmer.”

In an interview with The New York Times an hour before being formally approved by Parliament, the interim prime minister, Shahid Khaqan Abbasi — the petroleum minister who is a longtime politician, airline owner and skydiving buff — also vowed to fix what he described as political abnormalities between the executive, judicial and military branches that had felled previous governments.

Mr. Abbasi, 58, took over for Nawaz Sharif, the three-term prime minister who was long-plagued by corruption allegations. The Supreme Court ruled on Friday that Mr. Sharif was disqualified because of undeclared assets. The ruling was based partly on revelations of offshore wealth held by Mr. Sharif’s children, disclosed in leaked documents from Panama last year.

With strong fealty to Mr. Sharif, Mr. Abbasi will run Pakistan with the expectation of eventually being replaced by Mr. Sharif’s handpicked successor as leader of the dominant Pakistan Muslim League party — his younger brother Shehbaz Sharif, who must first vie for the parliamentary seat vacated by the former leader’s disqualification.