OTTAWA - Wajid Khan, the former Liberal MP who bolted to the Conservative government after working as an adviser to Prime Minister Stephen Harper, is in Central Asia this week.

Khan, whose last trip on Harper's behalf was made while still serving as a Liberal MP, is visiting Pakistan and Afghanistan until Wednesday. Khan, a former pilot in Pakistan's air force, is Harper's special adviser on the Middle East and Central Asia.

He has refused to appear before a Commons committee to discuss the findings of his last trip - a $13,000, 19-day tour of Syria, Jordan, Israel, Lebanon and Saudi Arabia in September.

Khan's report on that expedition has never been made public and the Prime Minister's Office has said it will remain confidential.

The Toronto MP defected to the Conservative backbenches in January.