Pakistan Muslim League-Nawaz supremo Nawaz Sharif apparently went abroad "with someone's understanding", PM's aide on accountability Shehzad Akbar said Sunday.Akbar said this during an exclusive interview with SAMAA TV. He said the Punjab government must investigate whether Nawaz's condition was really as serious as it was presented by the medical board.Nawaz was jailed in December 2018 for corruption in relation to his family’s ownership of a steel mill in Saudi Arabia.In November 2019, the government allowed him to leave the country to get medical treatment in London after his health deteriorated. He hasn’t come back since.The PM's aide said they would definitely bring the former premier back, however, it would not be an easy task.He also claimed that there was a split within the Sharif family."Whenever Maryam feels Shehbaz is trying to take the lead, she tries to spoil things," he said."By shaping a new narrative she reminds that 'I too claim the leadership'."