The Taliban have threatened to kill Imran Khan if he holds a planned march to their tribal stronghold to protest US drone attacks.
Although the Pakistani Taliban also oppose the strikes, which have killed many of their fighters, spokesman Ahsanullah Ahsan said they would target Khan because he calls himself a 'liberal' - a term they associate with a lack of religious belief.
Ahsan also warned they would attack anyone who participates in upcoming elections.
'If he comes, our suicide bombers will target him,' Ahsan told The Associated Press in an interview on Monday in the militant group's stronghold of South Waziristan. 'We will kill him.'
The threat could come as a surprise to many in Pakistan who have criticised Khan for not being tough enough on the Pakistani Taliban and instead focusing most of his criticism on the government's alliance with the US.
Some of his critics have nicknamed him 'Taliban Khan' because of his views and his cosy ties with conservative Islamists who could help him attract right-wing voters in national elections likely to be held later this year or early next year.
Khan, who is the founder of the Pakistan Movement for Justice party, has gained momentum over the past year after more than a decade in politics.
He is perhaps the most famous person in Pakistan because he led the country's cricket team to victory in the 1992 World Cup.
Khan was once known for his playboy lifestyle and marriage to British socialite Jemima Khan. But they divorced several years ago, and he has since become much more conservative and religious.
He has described himself as a liberal in various TV interviews, but has also made clear that he is a practising Muslim.
Ahsan, the Taliban spokesman, seemed to ignore that distinction and said the militants didn't want Khan's help in opposing drone attacks. Khan has said he is planning to lead thousands of people in a march to Waziristan in September to demonstrate against the strikes.
'We will not accept help or sympathy from any infidel,' said Ahsan, referring to Khan. 'We can fight on our own with the help of God,' he said, as drones buzzed overhead.
The spokesman for Khan's party could not be immediately reached for comment.
Ahsan said the Taliban consider anyone who participates in elections, even Islamist parties, as infidels and will target them.
'The election process is part of a secular system,' said Ahsan. 'We want an Islamic system and will create hurdles to secularism.'