A lawyer for Pakistan's former president Pervez Musharraf who is on trial for high treason says his client has been advised to go to the U.S. for medical treatment.

Anwar Mansoor Khan says he submitted a letter to the court on Thursday asking that Musharraf be transferred to the Paris Regional Medical Center in Paris, Texas.

Musharraf is a patient at the Armed Forces Institute of Cardiology in Rawalpindi. He was taken there after suffering a "heart problem" on the way to a court hearing.

The high treason case relates to his 2007 decision to impose a state of emergency and detain a number of judges.

Musharraf returned to Pakistan in 2013 hoping for a political comeback but instead got embroiled in court cases relating to his near-decade in power.