Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Passage: Abbasi's political career began after the death of his father Khaqan Abbasi in 1988. In May 1988, President Muhammad Zia-ul-Haq sacked the government of his handpicked Prime Minister, Muhammad Khan Junejo, and prematurely dissolved the National Assembly. Consequently, new parliamentary elections were called for 16 November 1988. Abbasi ran for the National Assembly seat from Constituency NA-36 (Rawalpindi-I), which had been held by his father until his death. Abassi was elected with 47,295 votes as an independent candidate. He acquired Rawalpindi's National Assembly seat for the first time at the age of 30 by defeating both Raja Zafar ul Haq, a candidate of Islami Jamhoori Ittehad (IJI), and Pakistan Peoples Party (PPP) candidate Raja Muhammad Anwar by a narrow margin. After winning the election he joined the IJI, which was newly founded in September 1988 by then Director-General of Inter-Services Intelligence to counter the PPP. His tenure as a Member of the National Assembly terminated after the National Assembly was dissolved prematurely in August 1990 following the dismissal of the government of Benazir Bhutto by President Ghulam Ishaq Khan.
 Link Information: Ghulam Ishaq Khan (; January 20, 1915 – 27 October 2006), was a Pakistani bureaucrat who served as the 7th President of Pakistan, elected in 1988 until his resignation in 1993. Question: When was the President who dissolved the National Assembly elected?
Output:
Answer: 1988