In an interview with the U.S. television network CBS due to be broadcast on September 24, Musharraf says the threat came from then-Deputy Secretary of State Richard Armitage and was delivered to Musharraf's intelligence director.
Armitage has denied Musharraf's claim and says he did not have the authority to make such a threat. Armitage said his message to Pakistan was that the country was either with the United States or against it in the battle against terrorists.
Musharraf is due to meet later on September at the White House in Washington with President George W. Bush.
(CBS, Reuters, AFP, AP)