What is the fine-grained topic of the following text: Following Prime Minister Imran Khan’s approval, we are about to write letters to Pakistan Muslim League-Nawaz President Shehbaz Sharif, Pakistan Peoples Part President Asif Ali Zardari and Jamiat-e-Ulema-e-Islam Fazl chief Maulana Fazlur Rehman,he added. Only return the topic.
Writing letters to Pakistani political leaders