Imran Khan says he was stopped by United States immigration officials and questioned about his views on American drone strikes in his home country.
Imran Khan, a former cricketer who is the leader of the Pakistan Movement for Justice party. He has campaigned for an end to the US missile strikes in Pakistan.
Khan, who was headed to New York, said he was taken from a plane in Canada and interrogated by US Immigration officials for about an hour
He said the delay meant he missed his flight and a fundraising event.